Refactoring

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

@@ -422,14 +422,15 @@ public class Helper {
     }
 
     static Boolean isIgnoringOptimizations(Context context) {
-        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
+        if (Build.VERSION.SDK_INT < Build.VERSION_CODES.M)
+            return null;
+
         PowerManager pm = (PowerManager) context.getSystemService(Context.POWER_SERVICE);
         if (pm == null)
             return null;
+
         return pm.isIgnoringBatteryOptimizations(BuildConfig.APPLICATION_ID);
     }
-        return null;
-    }
 
     static Integer getBatteryLevel(Context context) {
         try {