b18f83bcf404fee98713fd2eba82570efb53f13e
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
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