[BUG] Functionality Add Volunteer - **Acreditat de** field

[gheorghelupu17]

Environment: all
Steps to reproduce:

Acces web address https://rvm.code4.ro/ and login with valid username and password
2.Select an organization from the list and use the add volunteer buton;
In the new section try and complete the data acreditarii & acreditat de fields but leave the specializare field empty;
Choose an option from the dropdown in the specializare field and then click on adauga cursul (green square with [+] sign) leaving the acreditat de field empty
Expected results:
4. The empty-left field acreditat de should trigger an error to remind user that acreditat de is mandatory
Actual results:
Left empty while clicking the adauga cursul* button, the acreditat de field will display [object][object]:
https://youtu.be/6cRbAc48_jw
L.E: The youtube clip is unlisted -> only those who have the link can see it