unconditionally log request error

Somehow exception logging was conditional on successful request uri parsing.
Add it back for the other branch.

Author: pajod

gunicorn/workers/base.py

@@ -251,6 +251,8 @@ def handle_error(self, req, client, addr, exc):
         else:
             if hasattr(req, "uri"):
                 self.log.exception("Error handling request %s", req.uri)
+            else:
+                self.log.exception("Error handling request (no URI read)")
             status_int = 500
             reason = "Internal Server Error"
             mesg = ""