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
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The save button should not be greyed out.
The server should reject the POST request without corrupting the database
This problem is reproduced as follows:
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