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manifest: check 'if x is None' instead of 'if not x'...
manifest: check 'if x is None' instead of 'if not x' The old code here would end up executing __len__ on a tree manifest to determine if 'not _data' was true or not. This was very expensive on large repos. Since this function just cares about memoization, we can just check 'if _data is None' instead and save a bunch of time.
Durham Goode -
r31097:4a1486c7 default
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