Update empty tool window message

Author: oshando

swan-assist/src/main/resources/dialog_messages.properties

@@ -28,7 +28,7 @@ Launcher.ConfigurationFile= Classification List
 #Notifications when running SWAN
 Messages.Notification.Title.Completed = SWAN-Assist Analysis
 Messages.Notification.Completed = Analysis completed
-Messages.Notification.EmptyTree = Select a configuration file using the \"Import\" button
+Messages.Notification.EmptyTree = Run SWAN-Assist or import an existing SRM file to get started.
 Messages.Notification.NoFilterResults = No methods match the filters you've selected
 Messages.Title.Progress = Running SWAN-Assist Analysis