Rect light artifacts from NaN pixels on surfaces that are coplanar with light position

Rect lights cause artifacts (nan pixels) on pixels of surfaces that are coplanar with light position.  In RectLight.ush, in RectIrradianceLambert, at line 106, c30 is -1, so rsqrt(0) causes a nan to be generated.

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See the Additional Info URL for details and sample project.

1. In the attached project, open the RectLightsBug
2. Look at the cube face and move the camera direction

Expected
No white artifacts appear in the shadow on the cube

Actual
White artifacts appear in the shadow on the cube face that is facing the camera