Errors corrected in Arquimedes

Under certain conditions, the Arquimedes module: "Automatic quantity import from drawings and link with CAD programs" caused an error when the quantities had been exported from the CAD program. If, in the dialogue where the error text appeared, the "Exit" option was selected, users could import the measurements that had been carried out in the CAD program in Arquimedes without any problem. This error no longer appears in the 2019.c version.