[br] don't signal an error when there is a missing soft mutation after
     the word "eme" because mutation is then optional (according to the
     Breton method "Brezhonegom" by Tugdual Kalvez).


git-svn-id: https://languagetool.svn.sourceforge.net/svnroot/languagetool/trunk/languagetool@9813 2fe6a88b-1217-0410-b804-ba6ed01314b8