Make sure empty ECI return values are properly null terminated
Make sure empty ECI return values are properly null terminated

A last minute bug report from Avuton Olrich caught this
nasty bug that led to e.g. ecasignalview dumping core
no matter what parameters were passed.

jeremysalwen/Ecasound-LV2,jeremysalwen/Ecasound-LV2,jeremysalwen/Ecasound-LV2,jeremysalwen/Ecasound-LV2,jeremysalwen/Ecasound-LV2