Possibility to set an undefined time in the end date for a debate

Is your feature request related to a problem? Please describe.

Sometimes there are debates that aren't necessary predefined with an end date. This option will enable the possibility to set and undefined end date for a debate.

Describe the solution you'd like

1- As an admin, I could set an undefined time in the end date for a debate

Describe alternatives you've considered

We are open!

Additional context

This only affects in the debate componente.

Does this issue could impact on users private data?

No

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Barcelona en Comú