Check_MK Werk 4825: mkbackup: Fixed crash if size of backup is not reported because of a failure

ID: 4825 Title: mkbackup: Fixed crash if size of backup is not reported because of a failure Component: Checks & agents Level: 1 Class: Bug fix Version: 1.5.0i1 Previously the check crashed if the size has not been reported. This can happen if the backup fails directly from the beginning. This bug has always been in this plugin until now.