Prevent traceback when there are no network devices (#469339)

If a user boots from boot.iso, the installer will bring up the net
config dialog to configure the network interface so packages can
be found and installed.  If a user has no available network devices,
the window appears but nothing is in the combo box.  If they click
the combo box, you get a traceback.

This patch returns False from all enableNetwork() functions so the
user sees the 'No Network Available' dialog and is given the Exit
Installer button.

1 files changed, 2 insertions, 0 deletions

diff --git a/gui.py b/gui.py
index eb356f400..2fcc9e987 100755
--- a/gui.py
+++ b/gui.py
@@ -1162,6 +1162,8 @@ class InstallInterface:
         pass
 
     def enableNetwork(self, anaconda):
+        if len(anaconda.id.network.netdevices) == 0:
+            return False
         from netconfig_dialog import NetworkConfigurator
         net = NetworkConfigurator(anaconda.id.network)
         ret = net.run()