Fix checking for files in the output directory when it doesn't exist

[soaressgabriel]

Checklist

• Have you followed the guidelines in our Contributing document?
• Have you checked to ensure there aren't other open Pull Requests for the same update/change?
• Added tests for changed code.
• Updated documentation for changed code.

Description

• Moves file listing in the repository to after successful creation of the directory when it does not exist.

Related Issue

• Resolve Fix checking for files in the output directory when it doesn't exist #146.

Motivation and context

• See Fix checking for files in the output directory when it doesn't exist #146.

How has this been tested

1. Configure a simulation to use an output directory (valid path) that does not exist;
2. Run the simulation;
3. Verify that the output directory was created and the files resulting from the simulation are present.

Screenshots

• N/A

[LINAMARIAOSORIO]

Tested!