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/rescue.py b/rescue.py
index a9624ec11..67d573b1c 100644
--- a/rescue.py
+++ b/rescue.py
@@ -82,6 +82,8 @@ class RescueInterface:
 	    return OkCancelWindow(self.screen, title, text)
 
     def enableNetwork(self, anaconda):
+        if len(anaconda.id.network.netdevices) == 0:
+            return False
         from netconfig_text import NetworkConfiguratorText
         w = NetworkConfiguratorText(self.screen, anaconda)
         ret = w.run()