avoid to fail even with an empty faces-config.xml

git-svn-id: https://svn.apache.org/repos/asf/tomee/tomee/trunk@1455478 13f79535-47bb-0310-9956-ffa450edef68
Log error for any valid operation

git-svn-id: https://svn.apache.org/repos/asf/tomee/tomee/trunk@1455479 13f79535-47bb-0310-9956-ffa450edef68