Description of problem:

When using the system-config-lvm to create a new LV and make it persistent to a reboot the script hangs and do not create the fstab entry.

Traceback (most recent call last):
  File "/usr/share/system-config-lvm/InputController.py", line 655, in on_new_lv
    if dlg.run() == False:
  File "/usr/share/system-config-lvm/InputController.py", line 1339, in run
    if self.apply() == True:
  File "/usr/share/system-config-lvm/InputController.py", line 2029, in apply
    Fstab.add(None, lv_path, mountpoint_new, filesys_new.fsname)
  File "/usr/share/system-config-lvm/Fstab.py", line 27, in add
    fstab = __remove_and_replace(dev_path_old, line)
  File "/usr/share/system-config-lvm/Fstab.py", line 43, in __remove_and_replace
    paths = get_all_paths(mnt_device)
  File "/usr/share/system-config-lvm/Fstab.py", line 114, in get_all_paths
    follow_links_to_target(dev_path, paths)
  File "/usr/share/system-config-lvm/utilities.py", line 6, in follow_links_to_target
    o, s = execWithCaptureStatus('/bin/readlink', ['/bin/readlink', '-e', path])
  File "/usr/share/system-config-lvm/execute.py", line 15, in execWithCaptureStatus
    res = execWithCaptureErrorStatus(bin, args)
  File "/usr/share/system-config-lvm/execute.py", line 22, in execWithCaptureErrorStatus
    command = command + ' ' + arg
TypeError: cannot concatenate 'str' and 'NoneType' objects

Version-Release number of selected component (if applicable):

Red Hat Enterprise Linux 5.6
system-config-lvm-1.1.5-8.el5

How reproducible:

100%

Steps to Reproduce:

- Insert a new device in the system.
- Open system-config-lvm
- In the "Uninitialized Entities" select the new device added and click in the "Initialize Entity"
- Answer Yes when it request you to create a new partition.

- Select the "Partition 1" in the "Unallocated Volumes" and "Create new Volume Group"
- Insert "Volume Group Name": VolTest and left the other informations in the default.

- In "Volume Groups" select VolTest then VolTest 'Logical View'.
- Create New Logical Volume
	- LV name: lv-test
	- LV size: 1 Gigabytes
	- Filesystem: Ext3
	- Check 'Mount' and 'Mount when rebooted'
	- Mount point: /test
		The specified mount point, /test, does not exist. Do you wish to create it?
		Answer 'Yes'

  
Actual results:

system-config-lvm shows a traceback

Expected results:

system-config-lvm works as expected creating a fstab entry