NPE in ExpressionOperator.printCollection - backport from 2.7 (#2141)

Fixes #2136 
Backport from #2137

Signed-off-by: Radek Felcman <radek.felcman@oracle.com>

Author: rfelcman

foundation/org.eclipse.persistence.core/src/main/java/org/eclipse/persistence/expressions/ExpressionOperator.java

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 1998, 2022 Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 1998, 2024 Oracle and/or its affiliates. All rights reserved.
  * Copyright (c) 2018, 2022 IBM Corporation. All rights reserved.
  *
  * This program and the accompanying materials are made available under the
@@ -2387,8 +2387,7 @@ public void printCollection(List<Expression> items, ExpressionSQLPrinter printer
         }
 
         String[] dbStrings = getDatabaseStrings(items.size());
-        for (int i = 0; i < this.argumentIndices.length; i++) {
-            final int index = this.argumentIndices[i];
+        for (final int index : this.argumentIndices) {
             Expression item = items.get(index);
             if ((this.selector == Ref) || ((this.selector == Deref) && (item.isObjectExpression()))) {
                 DatabaseTable alias = item.aliasForTable(((ObjectExpression)item).getDescriptor().getTables().firstElement());