Use GameRegistry.findUniqueIdentifierFor().modId instead of finding ModContainer

[shadowfacts]

This prevents NPEs from being thrown extremely often during the tooltip event.

Also remove unnecessary/redundant call to RandomUtils.getItemOwner

[Tombenpotter]

Thaank you! :D

[shadowfacts]

No problem, I finally got annoyed enough by the all-too-often freezes to fix it :stuck_out_tongue:

[hilburn]

I have a question: why is in an event rather than part of the Sanguimancy Item?

Also GameRegistry.getUniqueIdentfier can return nulls