AAPT2: Fix source output when error occurs in style

            serializeReferenceToPb(entry.key, pbEntry->mutable_key());

            pb::Item* pbItem = pbEntry->mutable_item();

            serializeItemCommonToPb(*entry.value, pbEntry);

            serializeItemCommonToPb(entry.key, pbEntry);

            PbSerializerVisitor subVisitor(mSourcePool, mSymbolPool, pbItem);

            entry.value->accept(&subVisitor);

        }