Error when calling Komponent:pnh --> Aktion: Monitor

[jengra]

Steps to reproduce the issue:

1. Run ZAP;
2. Access the following URL while proxying through ZAP:

http://zap/JSON/pnh/action/monitor/?zapapiformat=JSON&id=1&message=testing

Logfile:
2015-08-20 15:33:34,490 [ZAP-ProxyThread-404] ERROR ZAP$UncaughtExceptionLogger - Exception in thread "ZAP-ProxyThread-404"
net.sf.json.JSONException: A JSONObject text must begin with '{' at character 1 of 1
at net.sf.json.util.JSONTokener.syntaxError(JSONTokener.java:499)
at net.sf.json.JSONObject._fromJSONTokener(JSONObject.java:972)
at net.sf.json.JSONObject._fromString(JSONObject.java:1201)
at net.sf.json.JSONObject.fromObject(JSONObject.java:165)
at net.sf.json.JSONObject.fromObject(JSONObject.java:134)
at org.zaproxy.zap.extension.plugnhack.PlugNHackAPI.handleApiAction(PlugNHackAPI.java:106)
at org.zaproxy.zap.extension.api.API.handleApiRequest(Unknown Source)
at org.parosproxy.paros.core.proxy.ProxyThread.processHttp(Unknown Source)
at org.parosproxy.paros.core.proxy.ProxyThread.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)

[kingthorin]

This is easy to recreate. It's unclear what the "message" param is supposed to be?

[thc202]

I don't think it needs to be clear this is an "internal" endpoint (but one can check it in pnh_probe.js), we just need to fix the exception handling.