fix: java.lang.NullPointerException: Cannot invoke "com.intellij.notification.NotificationGroup.createNotification(String, String, com.intellij.notification.NotificationType)" because "notificationGroup" is null

Author: SeeSharpSoft

src/main/java/net/seesharpsoft/intellij/plugins/csv/CsvPlugin.java

@@ -66,11 +66,11 @@ public void run(@NotNull ProgressIndicator progressIndicator) {
     public void runActivity(@NotNull Project project) {
         doAsyncProjectMaintenance(project);
 
-        if (CsvEditorSettings.getInstance().checkCurrentPluginVersion(getVersion())) {
+        NotificationGroup notificationGroup = NotificationGroupManager.getInstance().getNotificationGroup("net.seesharpsoft.intellij.plugins.csv");
+        if (notificationGroup == null || CsvEditorSettings.getInstance().checkCurrentPluginVersion(getVersion())) {
             return;
         }
 
-        NotificationGroup notificationGroup = NotificationGroupManager.getInstance().getNotificationGroup("net.seesharpsoft.intellij.plugins.csv");
         Notification notification = notificationGroup.createNotification(
                 "CSV Editor " + getVersion() + " - Change Notes",
                 getChangeNotes() +