feat(form): error instead of debug if field not found

This improves #2484 to show an error instead of a debug info, because it is basically expected to always return an existing field

Author: lubber-de

src/definitions/behaviors/form.js

@@ -642,7 +642,7 @@ $.fn.form = function(parameters) {
             if((t=$field.filter('[data-' + metadata.validate + '="'+ identifier +'"]')).length > 0 ) {
               return t;
             }
-            module.debug('Field identifier not found.', identifier);
+            module.error(error.noField.replace('{identifier}',identifier));
             return $('<input/>');
           },
           fields: function(fields) {
@@ -1629,6 +1629,7 @@ $.fn.form.settings = {
     method     : 'The method you called is not defined.',
     noRule     : 'There is no rule matching the one you specified',
     oldSyntax  : 'Starting in 2.0 forms now only take a single settings object. Validation settings converted to new syntax automatically.',
+    noField    : 'Field identifier {identifier} not found',
     noElement  : 'This module requires ui {element}'
   },