Several minor fixes

src/include/network/lan/udev.rb

@@ -63,10 +63,11 @@ def update_udevd
       # its Items[i, "udev", "net"], causing jumbled names (bnc#721520)
       # The udev trigger will make udev write the persistent names
       # (which it already has done, but we have overwritten them now).
-      SCR.Execute(
+      ret = SCR.Execute(
         path(".target.bash"),
         "udevadm trigger --subsystem-match=net --action=add"
-      ) == 0
+      )
+      ret == 0
     end
 
     # Removes (key,operator,value) tripplet from given udev rule.

src/include/network/widgets.rb

@@ -559,7 +559,7 @@ def handleDevice(items, selected)
     # @param [Array<Fixnum>] itemIds           list of indexes into LanItems::Items
     # @param [Array<String>] enslavedIfaces    list of device names of already enslaved devices
     def CreateSlaveItems(itemIds, enslavedIfaces)
-      raise ArgumentError if itemIds.nil?
+      raise ArgumentError, "no slave device defined" if itemIds.nil?
 
       items = []