Fixed restart

app/src/main/java/eu/faircode/email/ServiceSynchronize.java

@@ -1636,7 +1636,6 @@ public class ServiceSynchronize extends LifecycleService {
         }
 
         private void stop() {
-            if (main != null) {
             EntityLog.log(ServiceSynchronize.this, "Main stop " + main);
             synchronized (state) {
                 state.running = false;
@@ -1652,18 +1651,13 @@ public class ServiceSynchronize extends LifecycleService {
 
             EntityLog.log(ServiceSynchronize.this, "Main stopped " + main);
         }
-        }
 
         private void restart() {
+            if (running)
                 lifecycle.submit(new Runnable() {
                     @Override
                     public void run() {
                         stop();
-                }
-            });
-            lifecycle.submit(new Runnable() {
-                @Override
-                public void run() {
                         start();
                     }
                 });