On close, save view state of launch pad only for main client and if

server is still running.

ChangeLog

@@ -4,7 +4,7 @@
 * Post area in chat: now "multilined". Remove placeholder "Send message".
 * For remote clients, if remote control is disabled, display info in window title and nothing about token state. 
 * New login button for remote access login screen.
-* On close, save view state of launch pad only for main client. 
+* On close, save view state of launch pad only for main client and if server is still running. 
 
 4.0.18 29/05/2020
 ------

src/main/java/fr/ill/ics/client/control/MainWindow.java

@@ -442,8 +442,11 @@ public class MainWindow implements ServerConfigurationChangeListener, ServerEnde
 		ConfigManager.getInstance().savePreference(ConfigManager.MAGNIFY_FACTOR_INDEX, Magnifier.getScaleIndex() + "");
 
 		if (ConfigManager.getInstance().isMainClient()) {
-			String property = ConfigManager.LAUNCH_PAD_TEXT_MODE + "=" + String.valueOf(CommandWindow.getInstance().getServerTabButton().getCommandWorkspace().isInTextMode());
-			ResourceManager.getInstance().saveFile(ConfigManager.GLOBAL_PREFERENCES_FILE, property, ResourceManager.PROPERTIES_FILE, true);
+			boolean serverRunning = ServerConnection.getInstance(CommandZoneWrapper.SERVER_ID).serverExists();
+			if (serverRunning) {
+				String property = ConfigManager.LAUNCH_PAD_TEXT_MODE + "=" + String.valueOf(CommandWindow.getInstance().getServerTabButton().getCommandWorkspace().isInTextMode());
+				ResourceManager.getInstance().saveFile(ConfigManager.GLOBAL_PREFERENCES_FILE, property, ResourceManager.PROPERTIES_FILE, true);
+			}
 		} else {
 			ConfigManager.getInstance().savePreference(ConfigManager.REMOTE_USER_NAME, UserConnection.getInstance().getUserName());
 			ConfigManager.getInstance().savePreference(ConfigManager.REMOTE_INSTRUMENT, RemoteControlManager.getInstance().getInstrumentName());