Fix NPE #603

app/src/main/java/nodomain/freeyourgadget/gadgetbridge/util/NotificationUtils.java

@@ -42,7 +42,7 @@ public class NotificationUtils {
             case CONVERSATIONS:
             case FACEBOOK:
             case FACEBOOK_MESSENGER:
-                return notificationSpec.body;
+                return StringUtils.ensureNotNull(notificationSpec.body);
         }
         return "";
     }

app/src/main/java/nodomain/freeyourgadget/gadgetbridge/util/StringUtils.java

@@ -20,6 +20,7 @@ import android.support.annotation.NonNull;
 
 public class StringUtils {
 
+    @NonNull
     public static String truncate(String s, int maxLength){
         if (s == null) {
             return "";