Fixed block finder exceptioning when no tags are present.

[LeadAssimilator]

This should address issue #3

[thevortex]

so i have been trying to track down a rendering glitch for ages now, is this... that?

[LeadAssimilator]

Could be...this is what I ran into at least when playing ATM7/ATM7S where xray would completely stop working in certain dimensions.

I also ran into an issue with simultaneous potion usage where the expiration of the first one would turn off xray prematurely. I have a fix for that as well by ref counting the draw ores enable, but it got intermixed with some code cleanup and perf improvements and doesn't feel quite right. The fix works, but some things had to be done differently than I would have expected to make single player exit/rejoin behave correctly. I'd like to understand that behavior better before sharing it but that may be a while.

[thevortex]

i appreciate it :) the fix was not even in the ballpark of what i thought was wrong LOL i spent so much time getting nowhere with this thanks again :D