Fixed RenderManShader.acceptsInput() crash
Fixed RenderManShader.acceptsInput() crash

RenderManShader.acceptsInput used to crash when you called acceptsInput( None ) on one of its input plugs. This was bad. Now it doesn't. This is good.

davidsminor/gaffer,appleseedhq/gaffer,hradec/gaffer,ivanimanishi/gaffer,davidsminor/gaffer,chippey/gaffer,cedriclaunay/gaffer,lucienfostier/gaffer,johnhaddon/gaffer,ImageEngine/gaffer,andrewkaufman/gaffer,ivanimanishi/gaffer,davidsminor/gaffer,goddardl/gaffer,andrewkaufman/gaffer,lucienfostier/gaffer,appleseedhq/gaffer,goddardl/gaffer,andrewkaufman/gaffer,hradec/gaffer,GafferHQ/gaffer,appleseedhq/gaffer,ImageEngine/gaffer,chippey/gaffer,cedriclaunay/gaffer,boberfly/gaffer,cedriclaunay/gaffer,andrewkaufman/gaffer,johnhaddon/gaffer,ivanimanishi/gaffer,johnhaddon/gaffer,johnhaddon/gaffer,boberfly/gaffer,andrewkaufman/gaffer,boberfly/gaffer,lucienfostier/gaffer,chippey/gaffer,appleseedhq/gaffer,boberfly/gaffer,davidsminor/gaffer,GafferHQ/gaffer,GafferHQ/gaffer,hradec/gaffer,ImageEngine/gaffer,lucienfostier/gaffer,GafferHQ/gaffer,hradec/gaffer,goddardl/gaffer,johnhaddon/gaffer,GafferHQ/gaffer,chippey/gaffer,ivanimanishi/gaffer,hradec/gaffer,goddardl/gaffer,ImageEngine/gaffer,cedriclaunay/gaffer