Error when add a partner in Conferences without logo

[AriadnaVA]

Describe the bug
It's been reported that when an Admin tries to add a partner in a Conference without a logo, a server error is displayed (see screenshoots).
If you add a logo, there is no problem.

To Reproduce

1. Login as admin
2. Go to Conferences
3. Add a partner without submitting a logo.
4. Contemplate the error.

Expected behavior
It's expected to add partners without logos.

Screenshots
Error screenshoot:

I've been able to reproduce the bug:

On the other hand, if you submit a logo, there's no problem:

Extra data:

• Device: PC
• Device OS: Windows 10
• Browser: Chrome
• Decidim Version: 0.23
• Decidim installation: TryDecidim

Additional context
Bug reported on Metadeicidm: https://meta.decidim.org/processes/bug-report/f/210/proposals/15836

[nocode66]

Fix available in the following pull request: #7026

[andreslucena]

Thanks @AriadnaVA for the report and @nocode66 for the fix 🚀
Closing this issue