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Description of problem:
nm-connection-editor crashes when editing an Ethernet connection with 802.1X security

Version-Release number of selected component (if applicable):
nm-connection-editor-1.8.0-0.1.git20170326.f260f8a.el7

How reproducible:
80%

Steps to Reproduce:
1. Edit or create a new Ethernet connection
2. Select MD5 or PWD EAP method in the 802.1X security page
3. Save the connection

Actual results:
Segmentation fault

Created attachment 1284745 [details]
[PATCH] editor: fix crash when destroying 802.1x page

lgtm

TEST SETUP
On VM running under RHEL 7.4 Workstation x86_64 with GNOME desktop environment.
Component version: 
network-manager-applet-1.8.0-3.el7


TEST PROCEDURE
Log in to GNOME session.
Start nm-connection-editor.
Add a new connection of type Ethernet.
Assign a network device to that connection.
Use network authentication via IEEE 802.1x, MD5, username and password.
The bug in not present.


RESULTS
Upgrading the component: network-manager-applet
    from version: 1.8.0-0.1.git20170326.f260f8a.el7
      to version: 1.8.0-3.el7
has fixed the bug.

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHSA-2017:2299