RFR: Check if census endpoint is a URL before trying to parse it as a path.

[JornVernee via github.com]

The pull request has been updated with additional changes.

----------------

Added commits:
 - b09c2d0e:	- Change parameter name of isURL to 's'

Pull request:
http://git.openjdk.java.net/skara/pull/10

Webrevs:
 - full: https://openjdk.github.io/cr/skara/10/webrev.01
 - inc: https://openjdk.github.io/cr/skara/10/webrev.00-01

Updated full patch:
http://git.openjdk.java.net/skara/pull/10.diff

Fetch command:
git fetch https://github.com/openjdk/skara.git b09c2d0e:pr/10