'fixed' an import issue when some block inputs where unconnected.

[mariosgit]

I had trouble (re)importing below code in the GUI. Seems to be related to unconnected inputs.

Added a little check to avoid throwing an exception, so all the "correct" patchCords get imported anyway.

Cheers.

// GUItool: begin automatically generated code AudioInputI2S i2sIn; //xy=115.01885986328125,299.00000262260437 AudioFilterStateVariable filter1; //xy=132.76885223388672,235.2499771118164 AudioFilterStateVariable filter2; //xy=133.76886367797852,360.25 AudioMixer4 mixerIn1; //xy=265.02356338500977,236.2735824584961 AudioMixer4 mixerIn2; //xy=266.27357482910156,362.5235843658447 AudioOutputI2S i2sOut; //xy=945.0188598632812,145.00000262260437 AudioConnection patchCord1(i2sIn, 0, filter1, 0); AudioConnection patchCord2(i2sIn, 1, filter2, 0); AudioConnection patchCord3(filter1, 2, mixerIn1, 0); AudioConnection patchCord4(filter1, 2, mixerIn2, 1); AudioConnection patchCord5(filter2, 2, mixerIn2, 0); AudioConnection patchCord6(filter2, 2, mixerIn1, 1); AudioConnection patchCord31(mixerIn1, 0, i2sOut, 0); AudioConnection patchCord35(mixerIn2, 0, i2sOut, 0); // GUItool: end automatically generated code