AY-6740 CSV ingest: make Version column optional.

[robin-ynput]

Changelog Description

These changes resolves #16
Ensure the Version column in the CSV is optional:

• When it exists and it's filled up, will publish and enforce provided version (previous behavior)
• When it exists but it's empty, product will take next available version
• When it does not exist, default logic applies, product will take next available version

Additional info

Testing notes:

Tested via the command line and interactive mode using:

• AY_240319_0001_ABS - ay_240319_0001_abs_paths_60_empty.csv column exists but empty
• AY_240319_0001_ABS - ay_240319_0001_abs_paths_60_mixed.csv mix of version number and empty
• AY_240319_0001_ABS - ay_240319_0001_abs_paths_no_version.csv version column missing

How to use the CSV CLI interface

1. Create the relevant shot hierarchy in the project
2. Ensure CSV settings are properly set and OCIO config is enabled
3. Download resource material and edit CSV to point toward downloading paths
4. Run the CSV ingest via CLI or interactive mode (traypublisher)

[BigRoy]

Works for me.

[jakubjezek001]

Unfortunately I could not test it at the moment. But the code seems to be fine and @BigRoy tests were also passing, so perfect work!