[1963] NullPointerException in AbstractLocateInWorkbenchPartHandler

Bug: 1963
Change-Id: Icaaa4de49eb1f9dfd2a82974e1e3adde55b3706e
Signed-off-by: cong-bang.do <docongbang1993@gmail.com>

common/plugins/org.polarsys.capella.common.ui/src/org/polarsys/capella/common/ui/services/commands/AbstractLocateInWorkbenchPartHandler.java

@@ -1,5 +1,5 @@
 /*******************************************************************************
- * Copyright (c) 2006, 2016 THALES GLOBAL SERVICES.
+ * Copyright (c) 2006, 2018 THALES GLOBAL SERVICES.
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
  * which accompanies this distribution, and is available at
@@ -13,8 +13,10 @@
 
 import org.eclipse.core.commands.ExecutionEvent;
 import org.eclipse.core.commands.ExecutionException;
-import org.eclipse.jface.viewers.ISelection;
-import org.eclipse.ui.IWorkbenchPart;
+import org.eclipse.jface.viewers.ISelection;
+import org.eclipse.jface.viewers.ISelectionProvider;
+import org.eclipse.ui.IWorkbenchPart;
+import org.eclipse.ui.IWorkbenchPartSite;
 import org.eclipse.ui.IWorkbenchWindow;
 
 /**
@@ -34,9 +36,23 @@ public Object execute(ExecutionEvent event) throws ExecutionException {
     if (null == activePart) {
       return null;
     }
-    // Get the current selection from the active part.
-		handleSelection(activePart.getSite().getSelectionProvider()
-				.getSelection(), activePart, event);
+    // Get the current selection from the active part.
+    IWorkbenchPartSite site = activePart.getSite();
+    if (null == site) {
+      return null;
+    }
+
+    ISelectionProvider selectionProvider = site.getSelectionProvider();
+    if (null == selectionProvider) {
+      return null;
+    }
+
+    ISelection selection = selectionProvider.getSelection();
+    if (null == selection) {
+      return null;
+    }
+
+		handleSelection(selection, activePart, event);
     return null;
   }