Script.goto_assignments now always needs a call_path. Otherwise it raises a NotFoundError.

This change makes Jedi's behavior more consistent.

test/completion/usages.py

@@ -96,8 +96,7 @@ from import_tree.rename1 import abc
 #< (0, 32),
 from import_tree.rename1 import not_existing
 
-# shouldn't work
-#< 
+# Shouldn't work (would raise a NotFoundError, because there's no name.)
 from not_existing import *
 
 # -----------------