UDFs panic() when passed a point with a boolean field

[forestjohnsonpeoplenet]

Hello, I have been experimenting with applying filters to our entire metrics firehose using Kapacitor. The first thing I noticed was that i cannot use User Defined functions on a stream that contains points with boolean fields. It triggers this line to be hit:

https://github.com/influxdata/kapacitor/blob/master/udf/server.go#L522

For now I have created a patched version of kapacitor so I can work around this issue but I just thought I would bring it up here and I will post any interesting updates or insights related to this issue here.

For now I have simply added a case for bools which does nothing. So the bools will be stripped out rather than crashing kapacitor every time.