Empty responses should have no lines.

Previously, iterating the lines of an empty response would yield the empty string once. However, the iterator should instead never yield anything. This is consistent with file io; `open('/dev/null', 'rb').readlines()` is `[]`.

1 files changed, 1 insertions, 1 deletions

diff --git a/src/urllib3/response.py b/src/urllib3/response.py
index adc321e7..6090a735 100644
--- a/src/urllib3/response.py
+++ b/src/urllib3/response.py
@@ -792,7 +792,7 @@ class HTTPResponse(io.IOBase):
             return self._request_url
 
     def __iter__(self):
-        buffer = [b""]
+        buffer = []
         for chunk in self.stream(decode_content=True):
             if b"\n" in chunk:
                 chunk = chunk.split(b"\n")