Deploy VDB action gives no feedback when server is unavailable

The "Deploy VDB" action is enabled in Model Explorer context menu, but there is no feedback if you select it when server is not running.

1) The user should be shown a dialog, saying that no server is available.

2) When selecting the "Execute VDB" action, a dialog is shown - the Deploy action should do the same. The text on the Execute dialog needs some tweaking, though. Currently it says "Unable to establish connection to server 'admin'" - it should use the name of the server instead of 'admin'