fix: edge case in filling ALP encoded child on patches #939
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Realized that there's an unhandled edge case in #924, commented here
Essentially, on develop, if we have two chunks and the first chunk is all patches and the second chunk has 0 patches, then the patched values won't get filled in the encoded array. Not the end of the world (they're presumably full of integer approximations that don't round-trip), but if it's a case of outlier large values that are getting patched, then the encoded values will end up bitpacking poorly.
This PR fixes that.