fixed midi export for tracks that use instrument number 1

Author: DataGreed

polytrackermidi/exporters/midi.py

@@ -42,7 +42,7 @@ def get_list_of_instruments(self):
 
         for track in self.pattern.tracks:
             for step in track.steps:
-                if step.instrument_number:
+                if step.instrument_number is not None:  # can be zero
                     instruments.add(step.instrument_number)
 
         return sorted(instruments)

setup.py

@@ -5,7 +5,7 @@
     requirements = fh.read()
 setup(
     name = 'polyendtracker-midi-export',
-    version = '0.3.1',
+    version = '0.3.2',
     author = 'Alexey Strelkov',
     author_email = '[email protected]',
     license = 'MIT License',