ItEr46S04ValidacionEProbasFuncionaisItEr45S04: Fixing problem when moving a milestone.

Avoiding to show the resources text for a milestone since it doesn't
suppor it.

ganttzk/src/main/java/org/zkoss/ganttz/MilestoneComponent.java

@@ -33,4 +33,9 @@ public class MilestoneComponent extends TaskComponent {
         super(task, disabilityConfiguration);
     }
 
+    @Override
+    protected boolean canShowResourcesText() {
+        return false;
+    }
+
 }

ganttzk/src/main/java/org/zkoss/ganttz/TaskComponent.java

@@ -203,16 +203,26 @@ public class TaskComponent extends Div implements AfterCompose {
 
             @Override
             public void reloadResourcesTextRequested() {
-                smartUpdate("resourcesText", getResourcesText());
+                if (canShowResourcesText()) {
+                    smartUpdate("resourcesText", getResourcesText());
+                }
                 String cssClass = isSubcontracted() ? "box subcontracted-task"
                         : "box standard-task";
                 response("setClass", new AuInvoke(TaskComponent.this,
                         "setClass", cssClass));
             }
+
         };
         this.task.addReloadListener(reloadResourcesTextRequested);
     }
 
+    /**
+     * Note: This method is intended to be overridden.
+     */
+    protected boolean canShowResourcesText() {
+        return true;
+    }
+
     protected String calculateClass() {
         String classText;
         if (getSclass().equals("null")) {

navalplanner-webapp/src/main/java/org/navalplanner/web/planner/TaskElementAdapter.java

@@ -359,6 +359,9 @@ public class TaskElementAdapter implements ITaskElementAdapter {
 
         @Override
         public String getResourcesText() {
+            if (taskElement.getOrderElement() == null) {
+                return "";
+            }
             try {
                 return transactionService
                         .runOnAnotherReadOnlyTransaction(new IOnTransaction<String>() {