blockchain: fix a bug where a duplicate entry is possible in the mapslice #2134
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Duplicate entries are currently possible in the following scenario: 1: Add entries to the mapslice. 2: 1st map is full. Move onto the 2nd map. 3: Delete any entry in the first map. 4: Attempt to add an entry in the 2nd map. When attempting (4), the entry should just be overwritten but a duplicate gets added.
When attempting to insert an entry to the mapslice, we check all the underlying maps to ensure that the entry doesn't exist.
Pull Request Test Coverage Report for Build 8184106558Details
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Adds a test and fixes the bug to fix a case where a duplicate entry in the mapslice is possible.
Not sure if this is related to the other cases we've been seeing since the outpoints should never have duplicates, fixing this is good since the code is assuming that the mapslice will not have duplicates.