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Generalizing MCSampler infinite loop break

Daniel Wysocki requested to merge daniel.wysocki/rift:mc-sampler-break-infinite-loop into master

MCSampler can get stuck in a (practically) infinite loop if there is no contribution to the integral. This can happen either if the prior is zero, or if the actual integrand is zero. A fix was made for the prior case, but not the integrand, which was causing some of our high-SNR jobs to stall. This MR extends this fix to the integrand, and refactors the fix a little bit to minimize repetition.

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