[WICKETEXTJS-60] Parsing parameters in ExtEventAjaxBehavior does not handle "null" value correctly - Issues

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The ExtEventAjaxBehavior#respond parses parameters to JSONObject incorrectly. It's not aware of "null" value case

For example with the parameter "t9id=null", the result is

{"t9id": ["null"]}

rather

{"t9id": [JSONObject.NULL]}

It means that the call JSONObject#isNull() will return "false" because "null" string value is different from JSONObject.NULL.

discovered while testing

CMS-9250 All hippotranslation:id with "null" value makes a cluster & results in wrong linking of translation on folders

is a part of

WICKETEXTJS-59 Bump Wicket dependency to 6.19 for version 0.25