Issue with app_args

[Tognognongo]

The generator does not populate the jobs list if the app_args field in the configuration fie is empty:

"jobs": [
{
"type": "RB",
"qubits": [4],
"num_shots": [100],
"walltime" : 10,
"nthreads" : 2,
"app_logging_level" : 3
}
]

For the generator to populate the jobs list at least an empty dictionary must be passed:

"jobs": [
{
"type": "RB",
"qubits": [4],
"num_shots": [100],
"walltime" : 10,
"app_args" : {},
"nthreads" : 2,
"app_logging_level" : 3
}
]

Ideally both options should work