always update docking area

dockingvl/src/main/java/fr/soleil/docking/vl/VlDockDockingManager.java

@@ -127,7 +127,6 @@ public class VlDockDockingManager extends ADockingManager {
             try {
                 ous = new ObjectOutputStream(baos);
                 mainDockingDesktop.writeXML(ous);
-                perspective.setByteArray(baos.toByteArray());
             } catch (IOException e) {
                 dockingException = new DockingException(getClass().getSimpleName()
                         + ".updatePerspective(): Unexpected Error", e);
@@ -143,6 +142,7 @@ public class VlDockDockingManager extends ADockingManager {
                     }
                 }
             }
+            perspective.setByteArray(baos.toByteArray());
         }
         if (dockingException != null) {
             throw dockingException;