Fix ERXDisplayGroup.setSelectedObjects()

for display groups without a datasource, e.g. if specified via
setObjectArray(). Otherwise the selected objects get lost.

Frameworks/Core/ERExtensions/Sources/er/extensions/appserver/ERXDisplayGroup.java

@@ -227,7 +227,7 @@ public void setSelectedObjects(NSArray objects) {
 		if(log.isDebugEnabled()) {
 			log.debug("setSelectedObjects@" + hashCode()  + ":" + (objects != null ? objects.count() : "0"));
 		}
-		if (this instanceof ERXBatchingDisplayGroup) {
+		if (this instanceof ERXBatchingDisplayGroup || dataSource() == null) {
 			// keep previous behavior
 			// CHECKME a batching display group has its own _displayedObjects variable so setSelectionIndexes won't work
 			super.setSelectedObjects(objects);