cameras: None frame error universal, add test and test script #186
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We inconsistently raised
CameraErroror returnedNoneinread_camera_framebefore. Now we always returnNoneif a read fails, and we handle this case in theread_framehistorical method.This is via a bug reported where laser autofocus spot detect would fail on the
self.read_camera_frame().framein theread_frameimplementation.Tested By: Unit test, and a script modified to stress test all cameras (not just the hamamatsu). Also local sim still works.