Handle error on GAE when Model objects are used with the form. (closes …

…webpy#134)

The `has_key` method of Model object doesn't take any arugments and the
form module expects that it takes one argument. Handled it by catching
and ignoring the TypeError.

web/form.py

@@ -8,8 +8,15 @@
 import utils, net
 
 def attrget(obj, attr, value=None):
-    if hasattr(obj, 'has_key') and obj.has_key(attr): return obj[attr]
-    if hasattr(obj, attr): return getattr(obj, attr)
+    try:
+        if hasattr(obj, 'has_key') and obj.has_key(attr): 
+            return obj[attr]
+    except TypeError:
+        # Handle the case where has_key takes different number of arguments.
+        # This is the case with Model objects on appengine. See #134
+        pass
+    if hasattr(obj, attr):
+        return getattr(obj, attr)
     return value
 
 class Form(object):