Disable Desktop sharing and Video Telephony menu items if the corresponding operation sets aren't available.

src/net/java/sip/communicator/impl/gui/main/contactlist/MetaContactRightButtonMenu.java

@@ -454,6 +454,14 @@ private void init()
             OperationSetBasicTelephony.class) == null)
             this.callItem.setEnabled(false);
 
+        if (metaContact.getDefaultContact(
+            OperationSetVideoTelephony.class) == null)
+            this.videoCallItem.setEnabled(false);
+
+        if (metaContact.getDefaultContact(
+            OperationSetDesktopStreaming.class) == null)
+            this.desktopSharingItem.setEnabled(false);
+
         if (metaContact.getDefaultContact(
             OperationSetBasicInstantMessaging.class) == null)
             this.sendMessageItem.setEnabled(false);