Proposed patch for ClassicCommDetector.cpp for possible division by zero - fixes coverity 746805

[Gary Buhrmaster <gary.buhrmaster@…>]

This (proposed) patch needs to be carefully looked at by someone with commercial detection expertise, and presumably access to a good set of sample content so that any changes can be evaluated.

There is a feasible (although I believe very unlikely) code path where no pixels will be checked, resulting in a number of variables not being appropriately set, which could result in a divide by zero (and a some other questionable calculations). This code will bypass the code block if no pixels were checked.

Fixes coverity 746805 (possible division by zero)

Patch: ​https://github.com/garybuhrmaster/mythtv/commit/ef86c95b382eeb295c1eb1f291ad4bd088e731d9.patch

[Gary Buhrmaster <gary.buhrmaster@…>]

In c753154cebb04f29d974d6aa6a8f228275086211/mythtv:

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