Crashes when opening IP-XACT (IEEE 1685) format files

The tool crashes without any error message for every [IP-XACT (IEEE 1685)](https://en.wikipedia.org/wiki/IP-XACT) format file I have tried to open.  

There are many examples [here](https://github.com/kactus2/ipxactexamplelib), e.g., https://github.com/kactus2/ipxactexamplelib/blob/master/tut.fi/communication.bridge/wb_slave_spi_master/1.0/wb_slave_spi_master.1.0.xml.

