Fix gzip wrap to keep reading from the buffer once the inner loop has completed

util/gzipwrap.py

@@ -11,12 +11,9 @@ class GzipWrap(object):
     self.is_done = False
     
   def read(self, size=-1):
-    if self.is_done:
-      return ''
-
     # If the buffer already has enough bytes, then simply pop them off of
     # the beginning and return them.
-    if len(self.buffer) >= size:
+    if len(self.buffer) >= size or self.is_done:
       ret = self.buffer[0:size]
       self.buffer = self.buffer[size:]
       return ret