hg: use safehasattr instead of hasattr

hg: use safehasattr instead of hasattr

--- a/mercurial/hg.py	Mon Jul 25 15:19:43 2011 -0500
+++ b/mercurial/hg.py	Mon Jul 25 15:22:18 2011 -0500
@@ -537,7 +537,7 @@
 
 def remoteui(src, opts):
     'build a remote ui from ui or repo and opts'
-    if hasattr(src, 'baseui'): # looks like a repository
+    if util.safehasattr(src, 'baseui'): # looks like a repository
         dst = src.baseui.copy() # drop repo-specific config
         src = src.ui # copy target options from repo
     else: # assume it's a global ui object