mknx/smarthome — pull request #43 by ohinckel (2013-11-11 17:08:36+00:00)
Title: Add empty value check in kostal plugin

The status page of the Kostal inverter module returns the value 'x x x' in the status page in case no power is currently generated.

This patch adds a check for this /empty/ value and will avoid errors like this:
```Item solar.power.current: value x x x does not match type num. Via Kostal None```