fix potential crash on macOS when video input == nil

[publicarray]

My webcam in my mac has problems sometimes 😝

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This change is 

[GrayHatter]

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Reviewed 1 of 1 files at r1.
Review status: all files reviewed at latest revision, 1 unresolved discussion.

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src/cocoa/video.m, line 77 at r1 (raw file):

            }

            NSError *       error = NULL;

BTW While you're working in the OSX code, can you please try and fix these formatting atrocities that clang-format added in?

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Comments from Reviewable

[redmanmale]

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Reviewed 1 of 1 files at r1.
Review status: all files reviewed at latest revision, 1 unresolved discussion.

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Comments from Reviewable

[publicarray]

Review status: all files reviewed at latest revision, 1 unresolved discussion.

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src/cocoa/video.m, line 77 at r1 (raw file):

Previously, GrayHatter (Gregory Mullen) wrote…

BTW While you're working in the OSX code, can you please try and fix these formatting atrocities that clang-format added in?

I was wondering what this weird formating was. I aim to submit a new PR for format fixes soonish (next few days) ;)

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Comments from Reviewable

[robinlinden]

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Reviewed 1 of 1 files at r1.
Review status: all files reviewed at latest revision, 1 unresolved discussion.

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