[MPLUGIN-279] use default properties when no configuration in m-compiler-p

git-svn-id: https://svn.apache.org/repos/asf/maven/plugin-tools/trunk@1637762 13f79535-47bb-0310-9956-ffa450edef68
default value

git-svn-id: https://svn.apache.org/repos/asf/maven/plugin-tools/trunk@1637765 13f79535-47bb-0310-9956-ffa450edef68