Added error message for missing input files

[Zehvogel]

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• Added error message for missing input files

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(and minimal .gitignore)

resolves #5

[Zehvogel]

I would wait for #6 and then rebase

[andresailer]

Add required to the inputFiles argument?

[Zehvogel]

and stop supporting setting the input files directly in the steering file? I wanted to keep that option but I am open to be convinced. However, I have the feeling that this would kill k4run --help file.py.

[andresailer]

inputFiles = []
parser.add_argument("--inputFiles", action="extend", nargs="+", metavar=("file1", "file2"), help="One or multiple input files", required=True, default=inputFiles)

This way one can still set input files in the steering file. But I don't know about the --help then.

PS: or does that defeat the required ?
PPS: yes it would https://stackoverflow.com/a/33125971

[Zehvogel]

I wil adapt this to use extend as it is cleaner than the current state. I can try with required but I guess it will immediately quit after the parse_args() call in the steering file and never reach the second call in k4run...

[Zehvogel]

on second look I will keep this as it is now and not do more refactoring