remove defaults, update clean command

Author: nkansal96

Makefile

@@ -14,4 +14,9 @@ test:
 
 clean:
 	find . -name "*.pyc" -delete
-	find . -name "__pycache__" -delete
+	find . -name "__pycache__" -delete
+	rm -rf .pytest_cache htmlcov .coverage
+
+clean-all: clean
+	rm -rf .eggs *.egg-info dist
+

auroraapi/audio.py

@@ -157,9 +157,11 @@ def stream(length=0, silence_len=1.0):
 		yield chunk.tostring()
 
 def _is_silent(data):
+	if len(data) == 0:
+		return True
 	return max(data) < SILENT_THRESH
 
-def _pyaudio_record(length=0, silence_len=1.0):
+def _pyaudio_record(length, silence_len):
 	p = pyaudio.PyAudio()
 	stream = p.open(
 		rate=RATE,