Update to _response_handler

Account for situations where no Content-Length or Transfer-Encoding
headers are present in a response.

The length of the response.content could still indicate a response was
given.  The earlier raise_for_status() should catch bad HTTP responses
that return content.

Closes-bug: #1766660
Change-Id: I6739e26a039a898982f5cdc96d19d6992ed37737

jenkins/__init__.py

@@ -505,13 +505,14 @@ class Jenkins(object):
 
         headers = response.headers
         if (headers.get('content-length') is None and
-                headers.get('transfer-encoding') is None):
+                headers.get('transfer-encoding') is None and
+                (response.content is None or len(response.content) <= 0)):
             # response body should only exist if one of these is provided
             raise EmptyResponseException(
                 "Error communicating with server[%s]: "
                 "empty response" % self.server)
 
-        # Reponse objects will automatically return unicode encoded
+        # Response objects will automatically return unicode encoded
         # when accessing .text property
         return response
 

tests/helper.py

@@ -102,5 +102,6 @@ def build_response_mock(status_code, json_body=None, headers=None, **kwargs):
     # for some reason, wraps cannot handle attributes which are dicts
     # and accessed by key
     response.headers = real_response.headers
+    response.content = text
 
     return response