fhem.pl: attr error message shortened.


git-svn-id: svn://svn.code.sf.net/p/fhem/code@4935 2b470e98-0d58-463d-a4d8-8e2adae1ed80
fheminfo: model patch by justme1968


git-svn-id: svn://svn.code.sf.net/p/fhem/code@4936 2b470e98-0d58-463d-a4d8-8e2adae1ed80