One form of jsonCall not working in Comet context

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When using this form of jsonCall:

```
def jsonCall(jsCalcValue: JsExp, jsonContext: JsonContext, func: (JValue) ⇒ JValue): GUIDJsExp
```

When "func" is called in a comet context, the client receives an empty response.

Antonio said:

> Got it. This is the interaction of https://github.com/lift/framework/blob/master/web/webkit/src/main/scala/net/liftweb/http/CometActor.scala#L934
with https://github.com/lift/framework/blob/master/web/webkit/src/main/scala/net/liftweb/http/LiftServlet.scala#L637,
which means that a JsonResponse isn't ever generated correctly from a CometActor.
>
> That's going to be a doozy to fix… We may end up wanting to push notices via the comet
response while pushing JSON via the AJAX response. But always doing that could result
in strange ordering issues, and sometimes doing that could lead to lack of clarity about when
that will happen vs not.
>
> Will ponder it a bit; can you open an issue?

Start by tracing the interaction between CometActor.scala at line 934 and LiftServlet.scala at line 637 for the jsonCall overload using JsonContext and func. Determine how a JsonResponse should be generated from a CometActor so the client no longer receives an empty response, then verify the behavior in a Comet context.

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