Ability to test for missing `args`

[vladimirvivien]

Currently, an executing script will fail if an attempt is made to access a missing or undefined args. For instance, the following will fail:

def test_args:
    if args.myArg == "":

If myArg was not provided as script argument (--args or --args-file) the previous will fail.

As a script author, missing arguments should fail silently by returning empty string. Or provide a way to test their declaration.

[vladimirvivien]

@nrb Let me know if this summarize what you need. Thanks.

[nrb]

Yep, that sounds like what I'm looking for!