Small improvements

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

@@ -72,16 +72,22 @@ public class WorkerFts extends Worker {
                         Log.i("FTS index=" + id);
 
                         EntityMessage message = db.message().getMessage(id);
-                        if (message == null)
+                        if (message == null) {
-                            throw new FileNotFoundException("Message gone");
+                            Log.i("FTS gone");
+                            continue;
+                        }
 
                         File file = message.getFile(context);
                         String text = HtmlHelper.getFullText(file);
-                        if (TextUtils.isEmpty(text))
+                        if (TextUtils.isEmpty(text)) {
-                            throw new FileNotFoundException("Message empty");
+                            Log.i("FTS empty");
+                            continue;
+                        }
 
                         boolean fts = prefs.getBoolean("fts", false);
-                        if (fts)
+                        if (!fts)
+                            break;
+
                         try {
                             sdb.beginTransaction();
                             FtsDbHelper.insert(sdb, message, text);