Creating an alert with a field condition without the type breaks the alert list

[c8y3]

This problem is reproduced as follows:

• create a new count rule with a field condition with a name and value but without selecting the condition type
• button save can be clicked (it should still be greyed out)
• a request POST plugins/com.airbus_cyber_security.graylog.wizard/alerts is sent to the server with the field_rule type being an empty string (it is supposed to be an integer)
• there is a stack trace and then the list of alert rules can not be displayed anymore

=>

• The save button should not be greyed out.
• The server should reject the POST request without corrupting the database

[frantz45]

I confirm it's fixed in Wizard v5.2.0