Improve logging when input files are bad.
In the following log, the error should be the last printed message.
Reproduce
robin batsim_nosched_badinput.yaml
Log
+ batsim -p /home/carni/proj/batsim/platforms/nosuchplatform.xml -w /home/carni/proj/batsim/workload_profiles/test_workload_profile.json -e /tmp/robin/batsim_nosched_badinput/out --batexec
[0.000000] /home/carni/proj/batsim/src/batsim.cpp:271: [batsim/ERROR] Platform file '/home/carni/proj/batsim/platforms/nosuchplatform.xml' cannot be read.
[0.000000] [batsim/INFO] Workload '44f067' corresponds to workload file '/home/carni/proj/batsim/workload_profiles/test_workload_profile.json'.
To upload designs, you'll need to enable LFS and have an admin enable hashed storage. More information