oxcfxics: Relax error checking a bit to restore previous behavior

As blaxter suggested, we don't have a sane approach to test
what would happen if we like really fail here
So for now I am returnint old behavior partially until
we get more time to test it
provisioning: Get back to print function name and fix double __LINE__ printing
openchangedb/indexing: Handle indexing url validation in openchangedb layer

Indexing URLs must not:
- be NULL
- be empty

Also add a test case for this