Adding tests for call_if_exists()
Adding tests for call_if_exists()

dateutli/hackdfw,emonzain/PiProcessors,ulimartinez/hackdfw,emonzain/PiProcessors,dateutli/hackdfw,ulimartinez/hackdfw,dpcf/limonade,jnadaud/limonade,sofadesign/limonade,dateutli/hackdfw,emonzain/PiProcessors,dateutli/hackdfw,ulimartinez/hackdfw,ulimartinez/hackdfw