misc: ignore validation defined as regex but with no regex (#36442)

wcs/qommon/form.py

@@ -979,7 +979,7 @@ class ValidationWidget(CompositeWidget):
         if validation_method and validation_method.get('regex'):
             return validation_method.get('regex')
         if validation['type'] == 'regex':
-            return validation['value']
+            return validation.get('value')
         return None