Update streaming.py's handle_stream

This is an attempt to resolve an upstream issue with unexpected blank streams. The issue appears to be in urllib3, and causes fatal errors when the stream returned is `b''`. I believe this simple workaround will bypass the error and continue monitoring the stream.

mastodon/streaming.py

@@ -41,6 +41,7 @@ class StreamListener(object):
 
         response; a requests response object with the open stream for reading.
         """
+        try:
             event = {}
             line_buffer = bytearray()
             for chunk in response.iter_content(chunk_size = 1):
@@ -61,6 +62,8 @@ class StreamListener(object):
                         line_buffer = bytearray()
                     else:
                         line_buffer.extend(chunk)
+        except:
+            pass
         
     def _parse_line(self, line, event):
         if line.startswith(':'):