Checkmk Werk 11532: filestats: fix crash when no files are found

ID: 11532 Title: filestats: fix crash when no files are found Component: Checks & agents Level: 1 Class: Bug fix Version: 2.0.0i1 The filestats check has a new feature "Additional Rules for Files". The check crashed when this feature was enabled and all files within the file group matched to one of the additiional rules specified. This has been fixed.