Ignore missing backup file on error (#5910)

When a backup error occurs, it might be that the backup file hasn't
been created yet, e.g. when there is no space or no permission on
the target backup directory. Deleting the backup file would fail
in this case. Use missing_ok instead to ignore a missing backup file
on delete.

Author: agners

supervisor/backups/manager.py

@@ -552,12 +552,12 @@ async def _do_backup(
                 self._change_stage(BackupJobStage.FINISHING_FILE, backup)
 
         except BackupError as err:
-            await self.sys_run_in_executor(backup.tarfile.unlink)
+            await self.sys_run_in_executor(backup.tarfile.unlink, missing_ok=True)
             _LOGGER.error("Backup %s error: %s", backup.slug, err)
             self.sys_jobs.current.capture_error(err)
             return None
         except Exception as err:  # pylint: disable=broad-except
-            await self.sys_run_in_executor(backup.tarfile.unlink)
+            await self.sys_run_in_executor(backup.tarfile.unlink, missing_ok=True)
             _LOGGER.exception("Backup %s error", backup.slug)
             await async_capture_exception(err)
             self.sys_jobs.current.capture_error(