global commands moveMouseToNavigatorObject script: if trying to fetch…

… the point at the start of the current review position causes a LookupError (the TextInfo is currently not specifically on a valid point... e.g. no actual text in the displayModel if its a DisplayModel textInfo), fall back to using the navigator object's location, just as it would if there was a NotImplementedError. Fixes #1270

source/globalCommands.py

@@ -202,7 +202,7 @@ def script_moveMouseToNavigatorObject(self,gesture):
 		obj=api.getNavigatorObject() 
 		try:
 			p=api.getReviewPosition().pointAtStart
-		except NotImplementedError:
+		except (NotImplementedError, LookupError):
 			p=None
 		if p:
 			x=p.x