Fix copied from https://bugs.launchpad.net/wicd/+bug/1432423/comments/1

--- wicd-1.7.3/curses/netentry_curses.py	1969-12-31 19:00:00.000000000 -0500
+++ wicd-1.7.3/curses/netentry_curses.py	2015-08-11 23:26:19.999999649 -0400
@@ -538,11 +538,16 @@
         self.bitrates = wireless.GetAvailableBitrates()
         self.bitrates.append('auto')
         self.bitrate_combo.set_list(self.bitrates)
+
+        # bitrate property is sometimes None
+        chosen_bitrate = wireless.GetWirelessProperty(networkID, 'bitrate')
+        if chosen_bitrate not in self.bitrates:
+            chosen_bitrate = 'auto'
+
         self.bitrate_combo.set_focus(
-            self.bitrates.index(
-                wireless.GetWirelessProperty(networkID, 'bitrate')
-            )
+            self.bitrates.index(chosen_bitrate)
         )
+
         self.allow_lower_bitrates_chkbox.set_state(
             to_bool(self.format_entry(networkID, 'allow_lower_bitrates'))
         )
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