Allow numin and numout to be 0

Author: timothyschoen

Source/PluginProcessor.cpp

@@ -260,15 +260,13 @@ bool PlugDataAudioProcessor::isBusesLayoutSupported(const BusesLayout& layouts)
     {
         int nchb = layouts.getNumChannels(false, bus);
         if (nchb > 2) return false;
-        if (nchb == 0) return false;
         noutch += nchb;
     }
 
     for (int bus = 0; bus < layouts.inputBuses.size(); bus++)
     {
         int nchb = layouts.getNumChannels(true, bus);
         if (nchb > 2) return false;
-        if (nchb == 0) return false;
         ninch += nchb;
     }