TEIIDDES-1944: check jboss server prior to refreshing teiid instance

* Avoids throwing an exception when refreshing a stopped teiid instance
* Displays sensible error message instead

plugins/org.teiid.designer.dqp.ui/src/org/teiid/designer/runtime/ui/i18n.properties

@@ -234,6 +234,7 @@ serverInvalidUrlMsg = The  value "{0}" is not a valid Teiid URL
 serverRefreshActionText = Refresh
 serverRefreshActionToolTip = Refresh the selected Teiid Instance
 serverRefreshNoServer = No server selected to be refreshed
+serverRefreshParentNotConnected = The Teiid Instance cannot be refreshed since its parent JBoss Server "{0}" is not started
 serverRefreshServerSuccessful = Server connection refreshed
 
 serverDisconnectActionText = Disconnect

plugins/org.teiid.designer.dqp.ui/src/org/teiid/designer/runtime/ui/server/RefreshServerAction.java

@@ -81,8 +81,13 @@ else if (this.selectedServer == null) {
 
             @Override
             public void run() {
+                if (! selectedServer.isParentConnected()) {
+                    WidgetUtil.showError(UTIL.getString("serverRefreshParentNotConnected", selectedServer.getParent())); //$NON-NLS-1$
+                    return;
+                }
+
                 selectedServer.reconnect();
-                
+
                 if (selectedServer.getConnectionError() != null)
                     WidgetUtil.showError(selectedServer.getConnectionError());
                 else