[BitBucket user: Alain Mazy]
[BitBucket date: 2017-04-14.06:53:14]

It's been quite a common mistake to write
`Orthanc --config=/etc/orthanc/`

instead of 

`Orthanc /etc/orthanc/`

In the first case, you do get an immediate crash without any output in the log.  Would be nice to display a nice message