[android]: Fixed the appearance of an extra margin in the dialog when there is no title.

Also, add a tools:text attribute to the dialog_missed_maps.xml layout
for better preview in Android Studio.

android/app/src/main/java/app/organicmaps/routing/RoutingErrorDialogFragment.java

@@ -38,6 +38,8 @@ public class RoutingErrorDialogFragment extends BaseRoutingErrorDialogFragment
         ResultCodesHelper.getDialogTitleSubtitle(requireContext(), mResultCode, mMissingMaps.size());
     Pair<String, String> titleMessage = resHolder.getTitleMessage();
 
+    if (!TextUtils.isEmpty(titleMessage.first))
+    {
       TextView titleView = new TextView(requireContext());
       titleView.setText(titleMessage.first);
       titleView.setPadding(65, 32, 32, 16);
@@ -46,7 +48,7 @@ public class RoutingErrorDialogFragment extends BaseRoutingErrorDialogFragment
       titleView.setEllipsize(TextUtils.TruncateAt.END);
       titleView.setTypeface(null, Typeface.BOLD);
       builder.setCustomTitle(titleView);
-
+    }
     mMessage = titleMessage.second;
     builder.setNegativeButton(resHolder.getCancelBtnResId(), null);
     if (ResultCodesHelper.isDownloadable(mResultCode, mMissingMaps.size()))

android/app/src/main/res/layout/dialog_missed_maps.xml

@@ -15,6 +15,7 @@
     android:paddingEnd="@dimen/margin_base_plus"
     android:textAppearance="@style/MwmTextAppearance.Body2"
     android:visibility="gone"
+    tools:text="Select maps to download"
     tools:visibility="visible"/>
 
   <View