FIX: Addressing typos and undefined references#615

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patricknelson wants to merge 3 commits intobbc:masterfrom

patricknelson:fix-rescue-typo

Commits on Jul 20, 2019

FIX: Addressing typo in screensize (should be screen_size) that causes stack trace on read timeout instead of continuing gracefully.
patricknelson
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FIX: Also removing use of undefined 'invalid_image_name' (possibly regression caused by #578) and just reverting to hard-coded 'invalid.jpg' from before.
patricknelson
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Commits on Aug 21, 2019

FIX: Addressing another regression relating to missing "invalid" image (also typoed anyway). Instead extending existing pattern of differing failure images for various failure scenarios (blue).
patricknelson
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