add a null-guard PR 53754

git-svn-id: https://svn.apache.org/repos/asf/ant/core/trunk@1555356 13f79535-47bb-0310-9956-ffa450edef68

WHATSNEW

@@ -61,6 +61,9 @@ Fixed bugs:
    manifest or manifest attribute.
    Bugzilla Report 54171
 
+ * reading of compiler args has become more defensive
+   Bugzilla Report 53754
+
 Other changes:
 --------------
 

src/main/org/apache/tools/ant/util/facade/FacadeTaskHelper.java

@@ -131,8 +131,10 @@ public class FacadeTaskHelper {
             ImplementationSpecificArgument arg =
                 ((ImplementationSpecificArgument) e.next());
             String[] curr = arg.getParts(getImplementation());
-            for (int i = 0; i < curr.length; i++) {
-                tmp.add(curr[i]);
+            if (curr != null) {
+                for (int i = 0; i < curr.length; i++) {
+                    tmp.add(curr[i]);
+                }
             }
         }
         String[] res = new String[tmp.size()];