Do not run cleanup if backupfolder is not available
Do not run cleanup if backupfolder is not available

(cherry picked from commit b008d04e6a80b5cd9c5ef3ed7832415b33b5d514)

uroni/urbackup_backend,uroni/urbackup_backend,uroni/urbackup_backend,uroni/urbackup_backend,uroni/urbackup_backend,uroni/urbackup_backend,uroni/urbackup_backend