* commit 'c42848ed':
  ZP-840 Rename exception variable.
  ZP-840 Renamed exception variable.
  ZP-832 Do comparing only if the folder already has a folder stat, but still get the newFolderStat even if the folder has none yet.
  ZP-840 Catch StateInvalidException when in partial mode.
  ZP-840 Do not throw StateNotFoundException as this messes up Ping. Just treat it as StateInvalid (which is true, FD indicates a state that is not available), do not catch both types in Ping as only StateInvalidException will be thrown.
  ZP-839 Get collection count from SyncCollections, show 'no changes' only if nothing was queued (e.g. new exporter registered), fixed typo showing exceptions.
  ZP-840 Invalidate the folder stats in case the exporter state can not be found, improved PingableFolders(), refactored folder stat invalidated into a private method.
  ZP-840 On StateNotFoundException of the exporter state generate a fake change so Ping indicates the synchronization of the folder.
  ZP-841 Reset folderstat when SyncKey "0" is received.
  ZP-839 One line z-push-top announcement for multi-folder sync.