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As suggested by @sovrasov in PR #8288 we definitely need to unify the way that empty images are handled inside the imgproc module.

• 1️⃣ OPTION 1: generate an assertion (exception) from the moment an empty input is given
• 2️⃣ OPTION 2: do not fail, just silently copy with empty data and make output also empty

The second option will require the user to do all the checking on data validity himself.

Update 2020-03-01: option 1 - 15, option 2 - 5
Update 2020-04-30: option 1 - 16, option 2 - 6