diff --git a/openerp/osv/orm.py b/openerp/osv/orm.py
index 96f56ee6826..1efc9bea489 100644
--- a/openerp/osv/orm.py
+++ b/openerp/osv/orm.py
@@ -480,7 +480,9 @@ class browse_record(object):
         try:
             return self[name]
         except KeyError, e:
-            raise AttributeError(e)
+            import sys
+            exc_info = sys.exc_info()
+            raise AttributeError, "Got %r while trying to get attribute `%s`." % (e, name), exc_info[2]
 
     def __contains__(self, name):
         return (name in self._table._columns) or (name in self._table._inherit_fields) or hasattr(self._table, name)
@@ -3589,8 +3591,6 @@ class BaseModel(object):
 
         """
 
-        if not context:
-            context = {}
         self.check_access_rights(cr, user, 'read')
         fields = self.check_field_access_rights(cr, user, 'read', fields)
         if isinstance(ids, (int, long)):
@@ -3600,12 +3600,7 @@ class BaseModel(object):
         select = map(lambda x: isinstance(x, dict) and x['id'] or x, select)
         result = self._read_flat(cr, user, select, fields, context, load)
 
-        for r in result:
-            for key, v in r.items():
-                if v is None:
-                    r[key] = False
-
-        if isinstance(ids, (int, long, dict)):
+        if isinstance(ids, (int, long)):
             return result and result[0] or False
         return result
 
@@ -3739,34 +3734,37 @@ class BaseModel(object):
                 if field in self._columns:
                     fobj = self._columns[field]
 
-                if not fobj:
-                    continue
-                groups = fobj.read
-                if groups:
-                    edit = False
-                    for group in groups:
-                        module = group.split(".")[0]
-                        grp = group.split(".")[1]
-                        cr.execute("select count(*) from res_groups_users_rel where gid IN (select res_id from ir_model_data where name=%s and module=%s and model=%s) and uid=%s",  \
-                                   (grp, module, 'res.groups', user))
-                        readonly = cr.fetchall()
-                        if readonly[0][0] >= 1:
-                            edit = True
-                            break
-                        elif readonly[0][0] == 0:
-                            edit = False
-                        else:
-                            edit = False
+                if fobj:
+                    groups = fobj.read
+                    if groups:
+                        edit = False
+                        for group in groups:
+                            module = group.split(".")[0]
+                            grp = group.split(".")[1]
+                            cr.execute("select count(*) from res_groups_users_rel where gid IN (select res_id from ir_model_data where name=%s and module=%s and model=%s) and uid=%s",  \
+                                       (grp, module, 'res.groups', user))
+                            readonly = cr.fetchall()
+                            if readonly[0][0] >= 1:
+                                edit = True
+                                break
+                            elif readonly[0][0] == 0:
+                                edit = False
+                            else:
+                                edit = False
+
+                        if not edit:
+                            if type(vals[field]) == type([]):
+                                vals[field] = []
+                            elif type(vals[field]) == type(0.0):
+                                vals[field] = 0
+                            elif type(vals[field]) == type(''):
+                                vals[field] = '=No Permission='
+                            else:
+                                vals[field] = False
+
+                if vals[field] is None:
+                    vals[field] = False
 
-                    if not edit:
-                        if type(vals[field]) == type([]):
-                            vals[field] = []
-                        elif type(vals[field]) == type(0.0):
-                            vals[field] = 0
-                        elif type(vals[field]) == type(''):
-                            vals[field] = '=No Permission='
-                        else:
-                            vals[field] = False
         return res
 
     # TODO check READ access