Correct global name issues.

jedi/parser/__init__.py

@@ -147,7 +147,7 @@ class Parser(object):
         # We need to check raw_node always, because the same node can be
         # returned by convert multiple times.
         if symbol == 'global_stmt':
-            self.global_names += new_node.get_defined_names()
+            self.global_names += new_node.get_global_names()
         elif isinstance(new_node, pt.Lambda):
             new_node.names_dict = self.scope_names_stack.pop()
         elif isinstance(new_node, (pt.ClassOrFunc, pt.Module)) \

jedi/parser/tree.py

@@ -1128,6 +1128,9 @@ class GlobalStmt(KeywordStatement):
     __slots__ = ()
 
     def get_defined_names(self):
+        return []
+
+    def get_global_names(self):
         return self.children[1::2]