The refactoring in Ie1bb7df56a0 changed some internals in
ChangeNotesParser with respect to how we account for pruned entities
during parsing when the actual patch set is missing.
This leads to a lot of warnings in the logs. Judging from the code it
looks like we don't need to do extra book keeping anymore for pending
patch sets. We keep track of pruned entities separately.
This commit removes the line that adds all patch sets to the 'missing'
set. 'missing' is only ever added to in the logic following this line.
Instead, we populate it with patch sets that did not originate in
parsing a commit (= pending).
Change-Id: Ic11c4d32afe487669e85357bbed1d5d94d076a03
dc25cdd214