libnm-gtk: fix a possible crash on widgets destroy (rh #1254043)
https://bugzilla.redhat.com/show_bug.cgi?id=1254043 (cherry picked from commit 0d0e8431)
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432e48a2
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https://bugzilla.redhat.com/show_bug.cgi?id=1254043 (cherry picked from commit 0d0e8431)