Description of problem:
On installing guake on F22, I get this error message during installation of the rpm:

WARNING: Failed to parse default value `' for schema (/schemas/apps/guake/general/debug_mode)

Complete session:

# dnf install guake
Last metadata expiration check performed 0:23:05 ago on Tue Jun  2 17:13:27 2015.
Dependencies resolved.
=====================================================================================================================================================================================================
 Package                                                Arch                                      Version                                           Repository                                  Size
=====================================================================================================================================================================================================
Installing:
 gnome-python2                                          x86_64                                    2.28.1-15.fc22                                    fedora                                      51 k
 gnome-python2-gconf                                    x86_64                                    2.28.1-15.fc22                                    fedora                                      50 k
 guake                                                  x86_64                                    0.7.2-1.fc22                                      updates                                    302 k
 notify-python                                          x86_64                                    0.1.1-28.fc22                                     fedora                                      38 k
 pyxdg                                                  noarch                                    0.25-5.fc22                                       fedora                                      92 k
 vte                                                    x86_64                                    0.28.2-14.fc22                                    fedora                                     368 k

Transaction Summary
=====================================================================================================================================================================================================
Install  6 Packages

Total download size: 902 k
Installed size: 2.7 M
Is this ok [y/N]: y
Downloading Packages:
(1/6): notify-python-0.1.1-28.fc22.x86_64.rpm                                                                                                                        319 kB/s |  38 kB     00:00    
(2/6): gnome-python2-gconf-2.28.1-15.fc22.x86_64.rpm                                                                                                                 393 kB/s |  50 kB     00:00    
(3/6): guake-0.7.2-1.fc22.x86_64.rpm                                                                                                                                 1.9 MB/s | 302 kB     00:00    
(4/6): gnome-python2-2.28.1-15.fc22.x86_64.rpm                                                                                                                       1.4 MB/s |  51 kB     00:00    
(5/6): pyxdg-0.25-5.fc22.noarch.rpm                                                                                                                                  850 kB/s |  92 kB     00:00    
(6/6): vte-0.28.2-14.fc22.x86_64.rpm                                                                                                                                 2.9 MB/s | 368 kB     00:00    
-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
Total                                                                                                                                                                350 kB/s | 902 kB     00:02     
Running transaction check
Transaction check succeeded.
Running transaction test
Transaction test succeeded.
Running transaction
  Installing  : vte-0.28.2-14.fc22.x86_64                                                                                                                                                        1/6 
  Installing  : gnome-python2-2.28.1-15.fc22.x86_64                                                                                                                                              2/6 
  Installing  : gnome-python2-gconf-2.28.1-15.fc22.x86_64                                                                                                                                        3/6 
  Installing  : pyxdg-0.25-5.fc22.noarch                                                                                                                                                         4/6 
  Installing  : notify-python-0.1.1-28.fc22.x86_64                                                                                                                                               5/6 
  Installing  : guake-0.7.2-1.fc22.x86_64                                                                                                                                                        6/6 
WARNING: Failed to parse default value `' for schema (/schemas/apps/guake/general/debug_mode)
  Verifying   : guake-0.7.2-1.fc22.x86_64                                                                                                                                                        1/6 
  Verifying   : gnome-python2-gconf-2.28.1-15.fc22.x86_64                                                                                                                                        2/6 
  Verifying   : notify-python-0.1.1-28.fc22.x86_64                                                                                                                                               3/6 
  Verifying   : pyxdg-0.25-5.fc22.noarch                                                                                                                                                         4/6 
  Verifying   : gnome-python2-2.28.1-15.fc22.x86_64                                                                                                                                              5/6 
  Verifying   : vte-0.28.2-14.fc22.x86_64                                                                                                                                                        6/6 

Installed:
  gnome-python2.x86_64 2.28.1-15.fc22  gnome-python2-gconf.x86_64 2.28.1-15.fc22  guake.x86_64 0.7.2-1.fc22  notify-python.x86_64 0.1.1-28.fc22  pyxdg.noarch 0.25-5.fc22  vte.x86_64 0.28.2-14.fc22 

Complete!



Version-Release number of selected component (if applicable):
0.7.2-1.fc22.x86_64

How reproducible:
Everytime

Steps to Reproduce:
1. dnf install guake
2.
3.