message: Handled null navigation bar title
diff: @@ -228,7 +228,9 @@ public class ToolbarView extends Toolbar {
  void styleTitle() {
  if (titleChanged) {
  - SpannableString titleSpannable = new SpannableString(title);
  + SpannableString titleSpannable = null;
  + if (title != null) {
  + titleSpannable = new SpannableString(title);
  if (titleFontFamily != null)
  titleSpannable.setSpan(new TypefaceSpan(titleFontFamily), 0, title.length(), 0);
  if (titleFontWeight != null)
  @@ -237,6 +239,7 @@ public class ToolbarView extends Toolbar {
  titleSpannable.setSpan(new StyleSpan(ReactTypefaceUtils.parseFontStyle(titleFontStyle)), 0, title.length(), 0);
  if (titleFontSize != null)
  titleSpannable.setSpan(new AbsoluteSizeSpan(titleFontSize, true), 0, title.length(), 0);
  + }
  setTitle(titleSpannable);
  titleChanged = false;
  }
  