Fix the computer contact injection when the corresponding value in the CSV file is empty

[Lainow]

…e CSV file is empty

Checklist before requesting a review

Please delete options that are not relevant.

• I have performed a self-review of my code.
• I have added tests (when available) that prove my fix is effective or that my feature works.
• I have updated the CHANGELOG with a short functional description of the fix or new feature.
• This change requires a documentation update.

Description

• It fixes !42241
• Here is a brief description of what this PR does
  Correction of the “computer contact” entry when the corresponding value in the CSV file is empty. This did not happen systematically, but occurred in particular when a first computer was inventoried and a second one was also inventoried afterwards but without a linked user.

Screenshots (if appropriate):

[stonebuzz]

seems good for me