fix introduced failures having to do with removing the call to internal helper method #toNoNullStringArray()

git-svn-id: https://svn.apache.org/repos/asf/commons/proper/lang/trunk@1090821 13f79535-47bb-0310-9956-ffa450edef68

src/main/java/org/apache/commons/lang3/builder/ReflectionToStringBuilder.java

@@ -648,7 +648,8 @@ public class ReflectionToStringBuilder extends ToStringBuilder {
         if (excludeFieldNamesParam == null) {
             this.excludeFieldNames = null;
         } else {
-            this.excludeFieldNames = excludeFieldNamesParam.clone();
+            //clone and remove nulls
+            this.excludeFieldNames = toNoNullStringArray(excludeFieldNamesParam);
             Arrays.sort(this.excludeFieldNames);
         }
         return this;