Fix error handling: install an error handler in the urllib OpenerDirector rather then checking the return code from the server in the response returned from open.
Fix error handling: install an error handler in the urllib
OpenerDirector rather then checking the return code from the server
in the response returned from open.

git-svn-id: 5b1347ddac5aba1438c637217dfe0bb137609099@389 8efdbd46-c5fb-49ab-9956-99f62928ec21

icatproject/python-icat