changelog: fix readpending if no pending data exist (issue4609)...
changelog: fix readpending if no pending data exist (issue4609)
Since transaction are used for more than just changesets, it is possible
to have a transaction without new changesets at all. In this case no
''00changelog.i.a' are written. In all cases the 'changelog.readpending'
method is called if the repository has any pending data. The 'revlog' logic
provides empty content if the file is missing, so the whole operation
resulted in an empty changelog.
We now skip reading the pending file if it is missing.
