Toss out chunked data if we never read anything

we dont know how much is remaining if data is chunked!

Author: ladyada

adafruit_requests.py

@@ -249,7 +249,7 @@ def close(self):
             return
         # Make sure we've read all of our response.
         if self._cached is None:
-            if self._remaining > 0:
+            if self._remaining and self._remaining > 0:
                 self._throw_away(self._remaining)
             elif self._chunked:
                 while True: