Merge pull request #340 from teddyrendahl/no-channel

FIX: Do not assume widget has populated channels

pydm/application.py

@@ -531,6 +531,9 @@ def eventFilter(self, obj, event):
     # Not sure if showing the tooltip should be the job of the app,
     # may want to revisit this.
     def show_address_tooltip(self, obj, event):
+        if not len(obj.channels()):
+            logger.warning("Object %r has no PyDM Channels", obj)
+            return
         addr = obj.channels()[0].address
         QToolTip.showText(event.globalPos(), addr)
         # If the address has a protocol, and it is the default protocol, strip it out before putting it on the clipboard.