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Luca Rood b18f83bcf4 Fix T50141: Nabla zero division on texture force field
This sets forces to zero, when Nabla is zero and a grayscale texture is
used or texture mode is Gradient or Curl.

Nabla equal to zero was causing a zero division, and forces ended up
being set to `nan`.

Reviewed By: mont29

Differential Revision: http://developer.blender.org/D2393
2016-12-04 18:01:46 -02:00
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