Improve error handling to report the actual error in case of an error in the custom service

[ThomasDelteil]

Trying to start my service in a docker container I got this error:

[ERROR 2018-05-11 03:19:46,356 PID:463 /usr/local/lib/python2.7/dist-packages/mms/mxnet_model_server.py:_arg_process:177] Failed to process arguments: Incorrect or missing service file: /mxnet_model_server/visualsearch/service.py

The actual error after debugging was an import error in my service file:

No module named wget

Ideally that should be bubbled up rather than just saying it is incorrect

[lupesko]

Great call, and this is not a feature request, it is a plain old bug :)
@vrakesh can we get this in to v0.4 release please?

[vrakesh]

will look into this, and get it fixed for 0.4

[vrakesh]

Resolved in PR #391

[ThomasDelteil]

@vrakesh thanks!