Added catch for NoneType

sonogram_utility.py

@@ -413,7 +413,7 @@ def calcSpeakingTypes(pipeline,myAnnotation,maxTime):
     categorySegmentList, timeSteps = pipeline.annotationToNoiseList(myAnnotation)
     # [group,individual,silence], each as (start,duration)
     for seg in categorySegmentList[0]:
-        if seg[0] == 'group':
+        if seg[0] == 'group' or seg[0] is None:
             mvAnnotation[seg[1]] = 'unclear'
         else:
             mvAnnotation[seg[1]] = seg[0]