BuildCraft/BuildCraft — pull request #1799 by M3gaFr3ak (2014-05-12 18:22:27+00:00)
Title: Fix drain method causing dupe glitches...

...if using them mixed

Before the one accepting a FluidStack always returned null if the targeted tank was empty, but the one under it wasnt, the one w/ int doesnt have the problem.

fixes: https://github.com/BuildCraft/BuildCraft/issues/1798