fix a problem related to #246: comments were used as normal strings

jedi/evaluate.py

@@ -791,7 +791,8 @@ def filter_private_variable(scope, call_scope, var_name):
 def goto(stmt, call_path=None):
     if call_path is None:
         commands = stmt.get_commands()
-        assert len(commands) == 1
+        # Only the first command is important, the rest should basically not
+        # happen except in broken code (e.g. docstrings that aren't code).
         call = commands[0]
         if isinstance(call, (str, unicode)):
             call_path = [call]