Only mark flow grade unavailble upon unavailable page grade if page c…#622

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inducer wants to merge 3 commits intomainfrom fix-max-points-0-handling

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Commits on Oct 2, 2018

Only mark flow grade unavailble upon unavailable page grade if page carries value
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Commits on Oct 31, 2018

*Actually* only mark flow grade unavailable if page carries value (previous logic flipped)
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Merge branch 'master' into fix-max-points-0-handling
inducer
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