FIX for #841: NPTR causing crash to desktop due to etching acid missing icon#898

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LachimHeigrim wants to merge 1 commit intoMaartenKok8:masterfrom

LachimHeigrim:master

Commits on Feb 28, 2017

FIX #841: Etching acid fluid return NULL still and flow icons, causing crash to desktop when acid was placed. Additionally the world would not load and repeat crashing.
LachimHeigrim
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