Put calls to PZP inside a try/catch to avoid crash

Jira issue: WP-1174
Merge pull request #49 from smonteleone/WP-1174-get-data-for-generic-uri

Put calls to PZP inside a try/catch to avoid crash
Merge remote-tracking branch 'webinos/master' into WP-332
GenericURI support for PZ-Owner and known PZHs

Added support, in the js code of policy manager, for the
following Generic URIs:

http://webinos.org/subject/id/PZ-Owner
http://webinos.org/subject/id/known

Jira issue: WP-332