Include uper level pointers of change events for receiving feature ev…

…ents, even if only one subpath is existent

Signed-off-by: David Schwilk <david.schwilk@bosch.io>

java/src/main/java/org/eclipse/ditto/client/internal/bus/SelectorUtil.java

@@ -172,11 +172,7 @@ private static List<JsonPointer> calculateJsonPointerHierarchy(final JsonPointer
                     if (value.isObject()) {
                         final List<JsonPointer> pointersOnLevel = new ArrayList<>();
                         final JsonObject objectOnLevel = value.asObject();
-                        if (objectOnLevel.getSize() > 1) {
-                            // if more than one sub-fields are contained in the object on this level, we add the "parent"
-                            // aggregating both of the changed fields:
                             pointersOnLevel.add(pointerOnLevel);
-                        }
 
                         // recurse further "down":
                         pointersOnLevel.addAll(calculateJsonPointerHierarchy(pointerOnLevel, objectOnLevel));