Pull #361: clear report diff summary if it exists already
Pull #361: clear report diff summary if it exists already

rnveach/contribution,checkstyle/contribution,checkstyle/contribution,rnveach/contribution,checkstyle/contribution,rnveach/contribution,checkstyle/contribution,rnveach/contribution,checkstyle/contribution,rnveach/contribution,rnveach/contribution,rnveach/contribution,checkstyle/contribution,checkstyle/contribution