Merge "Fix aapt2 JavaClassGenerator Maybe#value() call before check"

    auto documentation_remove_iter = std::remove_if(documentation_attrs.begin(),

                                                    documentation_attrs.end(),

                                                    [&](StyleableAttr entry) -> bool {

      StringPiece attr_comment_line = entry.symbol.value().attribute->GetComment();

      return SkipSymbol(entry.symbol) || attr_comment_line.contains("@removed")

                                      || attr_comment_line.contains("@hide");

      if (SkipSymbol(entry.symbol)) {

        return true;

      }

      const StringPiece attr_comment_line = entry.symbol.value().attribute->GetComment();

      return attr_comment_line.contains("@removed") || attr_comment_line.contains("@hide");

    });

    documentation_attrs.erase(documentation_remove_iter, documentation_attrs.end());