Missing failure check in OGR Provider OgrSpatialContextReader::GetExtent()

[gabrimonfa]

In OGR Provider, file OgrProvider.cpp, line 664, in function FdoByteArray* OgrSpatialContextReader::GetExtent())

/*OGRErr err =*/ m_connection->GetOGRDataSource()->GetLayer(m_nIndex)->GetExtent(&e, TRUE);

than e is used without any check.

It would be safer to check for a OGR failure and in case throws the appropriate exception.