[pygobject] Use hasattr when testing for __info__ when finding vfuncs

[Simon Feltman <sfeltman src gnome org>]

commit 21076d4b8f3ec8e253ca236fa3b20b07fde237fe
Author: Simon Feltman <sfeltman src gnome org>
Date:   Wed Nov 7 03:49:24 2012 -0800

    Use hasattr when testing for __info__ when finding vfuncs
    
    Change gi.types.find_vfunc_info_in_interface to use hasattr
    when finding vfuncs. Using '__info__' in __dict__ was skipping
    overridden interfaces which don't directly contain the __info__.

 gi/types.py |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/gi/types.py b/gi/types.py
index fb4b5f8..af3310a 100644
--- a/gi/types.py
+++ b/gi/types.py
@@ -191,7 +191,7 @@ def find_vfunc_info_in_interface(bases, vfunc_name):
         # Skip bases without __info__ (static _gobject._gobject.GObject)
         if base is GInterface or\
                 not issubclass(base, GInterface) or\
-                not '__info__' in base.__dict__ or\
+                not hasattr(base, '__info__') or\
                 not isinstance(base.__info__, InterfaceInfo):
             continue