[telepathy-butterfly/master] Only call RequestStream if a Initial* property is present

[Olivier Le Thanh Duong]

---
 butterfly/channel/media.py |    5 +++--
 1 files changed, 3 insertions(+), 2 deletions(-)

diff --git a/butterfly/channel/media.py b/butterfly/channel/media.py
index e35910e..2b5cde4 100644
--- a/butterfly/channel/media.py
+++ b/butterfly/channel/media.py
@@ -96,13 +96,14 @@ class ButterflyMediaChannel(
                 'InitialAudio': CHANNEL_TYPE_STREAMED_MEDIA,
                 'InitialVideo': CHANNEL_TYPE_STREAMED_MEDIA,
                 })
+
         if props.get(initial_audio_prop, False):
             types.append(MEDIA_STREAM_TYPE_AUDIO)
         if props.get(initial_video_prop, False):
             types.append(MEDIA_STREAM_TYPE_VIDEO)
-        self.RequestStreams(handle, types)
-        
 
+        if types:
+            self.RequestStreams(handle, types)
 
     def Close(self):
         logger.info("Channel closed by client")
-- 
1.5.6.5