Fix s2repoze check for content length

Signed-off-by: Ivan Kanakarakis <[email protected]>

Author: c00kiemon5ter

src/saml2/s2repoze/plugins/sp.py

@@ -470,7 +470,7 @@ def identify(self, environ):
 
         is_request = "SAMLRequest" in query
         is_response = "SAMLResponse" in query
-        has_content_length = "CONTENT_LENGTH" in environ or environ["CONTENT_LENGTH"]
+        has_content_length = environ.get("CONTENT_LENGTH")
 
         if not has_content_length and not is_request and not is_response:
             logger.debug("[identify] get or empty post")