Add explict default case

git-svn-id: https://svn.apache.org/repos/asf/commons/proper/lang/trunk@1565252 13f79535-47bb-0310-9956-ffa450edef68

src/main/java/org/apache/commons/lang3/BooleanUtils.java

@@ -627,6 +627,8 @@ public static Boolean toBooleanObject(final String str) {
                 }
                 break;
             }
+        default:
+            break;
         }
 
         return null;