Description of problem:

Tested on latest MTA-7.3.0-8 when tried to upload and Add bad or unaccepted indentation of custom rule file MTA UI gets break. For example I tried the yaml name python_rules_1.yaml
  Error message: Asked to refresh the page

bad indentation of a sequence entry (22:2) 19 | when: 20 | python.referenced: 21 | pattern: "create_custom_re ... 22 | - message: python sample rule 004 -------^ 23 | ruleID: python-sample-rule-004 24 | description: sample-rule-4 - 

Version-Release number of selected component (if applicable):

7.3.0-8