Making entity birthday optionalble

back/app/entity/models.py

@@ -23,10 +23,9 @@ class Individual(EntityType):
         props={"items-per-row": "4", "numbered": True},
         title="Surnoms"
     )
-    day_of_birth: date = Field(title='Date de naissance')
+    day_of_birth: date = Field(default=None, title='Date de naissance')
     place_of_birth: str = Field(default="", title='Lieu de naissance')
 
-
     @property
     def label(self) -> str:
         if len(self.surnames) > 0: