[TurboGears] Schema errors not picked up in cherrypy.request.form_errors

[Dan Jacob]

When using a schema the form_errors variable in cherrypy.request is not
updated (version 0.9, latest version from subversion).

For example:

class TestSchema(formencode.schema):
    description = validators.MinLength(3)

class Root:

   @turbogears.expose(validators=TestSchema())
   def update(self, description, has_errors=False):
       if has_errors:
         flash(cherrypy.request.form_errors['description'])
         raise HTTPRedirect, '/form'
       # rest of method

This returns a key error, as the cherrypy.request.form_errors dict is
empty.

The reason for this is line 190 in controllers.py:
errors = error.error_dict
This should read:
errors.update(error.error_dict)

so that the cherrypy.request.form_errors variable is filled with the
schema errors.