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Don't use non-aligned frame for stacking

Andrey Skvortsovrequested to merge
AndreySV/postprocessd:fix/terminate-on-uncorrelated-frames into master

Otherwise if frame is uncorrelated (for example, black), when postprocessing terminated and client (megapixels) waited a long time until socket error happened.

terminate called after throwing an instance of 'cv::Exception'
  what():  OpenCV(4.10.0) ./modules/video/src/ecc.cpp:589:
  error: (-7:Iterations do not converge) The algorithm stopped before
  its convergence. The correlation is going to be minimized. Images
  may be uncorrelated or non-overlapped in function 'findTransformECC'

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