Patrick Labatut 745aaf3915 No side effect with invalid inputs to save_obj / save_ply
Summary: Do not create output files with invalid inputs to `save_{obj,ply}()`.

Reviewed By: bottler

Differential Revision: D20720282

fbshipit-source-id: 3b611a10da6f6eecacab2a1900bf16f89e2000aa
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