False error in logs about distro detection

[gvallee]

$ sycontainerize -conf ./ubuntu-disco-hello.conf -d
2019/12/08 17:49:22 * Slurm not detected
2019/12/08 17:49:22 * Infiniband not detected
2019/12/08 17:49:24 * Checking for Singularity	pass
2019/12/08 17:49:24 * Checking for wget	pass
2019/12/08 17:49:24 * Checking for gfortran	pass
2019/12/08 17:49:24 * Checking for gcc	pass
2019/12/08 17:49:24 * Checking for g++	pass
2019/12/08 17:49:24 * Checking for make	pass
2019/12/08 17:49:24 * Checking for file	pass
2019/12/08 17:49:24 * Checking for mksquashfs	pass
2019/12/08 17:49:24 * Checking for bzip2	pass
2019/12/08 17:49:24 * Checking for newuidmap	pass
2019/12/08 17:49:24 * Checking for tar	pass
2019/12/08 17:49:24 * Loading the tool's configuration...
2019/12/08 17:49:24 -> Creating/updating SyMPI configuration file: /home/gvallee/.sympi/singularity-mpi.conf
2019/12/08 17:49:24 * Creating container for your application...
2019/12/08 17:49:24 * Loading configuration from ./ubuntu-disco-hello.conf
2019/12/08 17:49:24 [WARN]  an invalid distro ID

And the creation works as expected so the warning is really a false-positive.