Small improvements

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

@@ -2214,6 +2214,7 @@ public class Log {
         try (OutputStream os = new BufferedOutputStream(new FileOutputStream(file))) {
             for (SimpleTask task : SimpleTask.getList())
                 size += write(os, String.format("%s\r\n", task.toString()));
+            size += write(os, "\r\n");
             for (TwoStateOwner owner : TwoStateOwner.getList())
                 size += write(os, String.format("%s\r\n", owner.toString()));
         }

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

@@ -45,10 +45,12 @@ public class TwoStateOwner implements LifecycleOwner {
 
     private static DateFormat DTF = SimpleDateFormat.getDateTimeInstance(DateFormat.SHORT, DateFormat.SHORT);
 
-    private static List<TwoStateOwner> list = new ArrayList<>();
+    private static final List<TwoStateOwner> list = new ArrayList<>();
 
     static List<TwoStateOwner> getList() {
-        return list;
+        synchronized (list) {
+            return new ArrayList<>(list);
+        }
     }
 
     // https://developer.android.com/topic/libraries/architecture/lifecycle#lc
@@ -91,7 +93,7 @@ public class TwoStateOwner implements LifecycleOwner {
                 list.add(this);
             }
         } else
-            Log.i(this + " not owned");
+            Log.e(this + " not owned");
     }
 
     void start() {