Fix: Filesystems (absent medium)

git-svn-id: svn://svn.code.sf.net/p/fhem/code@4795 2b470e98-0d58-463d-a4d8-8e2adae1ed80
SYSMON

git-svn-id: svn://svn.code.sf.net/p/fhem/code@4796 2b470e98-0d58-463d-a4d8-8e2adae1ed80