tif_luv: Check and correct for NaN data in uv_encode().

Su Lausrequested to merge
Su_Laus/libtiff:tif_luv_check_NaN_fix_#530 into master

tif_luv: Check and correct for NaN data in uv_encode().

Closes #530 (closed)

See merge request !473 (merged)

Edited by Su Laus

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