Fix regression in password parsing

.. introduced in last commit of form parser.

Author: schlatterbeck

roundup/cgi/form_parser.py

@@ -401,8 +401,7 @@ def parse(self, create=0, num_re=re.compile('^\d+$')):
                                               config=self.db.config)
                 except hyperdb.HyperdbValueError, msg:
                     raise FormError (msg)
-
-            if d['file']:
+            elif d['file']:
                 # This needs to be a Multilink and is checked above
                 fcn = 'file'
                 fcl = self.db.classes[fcn]