FBX export: Fix a stupid C&P typo.
Fix T39792: Tangents/bitangents missing from exported FBX model.

Yet another stupid mistake. :/
Followup to fixes regarding armature layers operators.
Merge remote-tracking branch 'hm-blender/master'

* hm-blender/master:
  Followup to fixes regarding armature layers operators.
  Fix T39792: Tangents/bitangents missing from exported FBX model.
  FBX export: Fix a stupid C&P typo.
Fix for FBX exporting Area Lights
Fix T39877: Error exporting X3D with zero scale
Merge remote-tracking branch 'hm-blender/master'

* hm-blender/master:
  Fix T39877: Error exporting X3D with zero scale
  Fix for FBX exporting Area Lights
FBX export: Fix to 'nearly equal' func (would break when both values were 0).
Merge remote-tracking branch 'hm-blender/master'

* hm-blender/master:
  FBX export: Fix to 'nearly equal' func (would break when both values were 0).
FBX export: also export armature matrix in binding data of clusters

Looks like nothing is expected for BindPose nodes here? Anyway, I'd guess those are
doublons with cluster data... :/
FBX export: write clusters for non-deforming bones too (need their 'rest pose' matrices...)
Merge remote-tracking branch 'hm-blender/master'

* hm-blender/master:
  FBX export: write clusters for non-deforming bones too (need their 'rest pose' matrices...)
  FBX export: also export armature matrix in binding data of clusters