[Backend] API Inscription Parent - REFONTE Workflow 6 etapes (#72)

Co-authored-by: Julien Martin <julien.martin@ptits-pas.fr>
Co-committed-by: Julien Martin <julien.martin@ptits-pas.fr>

backend/src/routes/enfants/dto/create_enfants.dto.ts

@@ -29,10 +29,10 @@ export class CreateEnfantsDto {
     @MaxLength(100)
     last_name?: string;
 
-    @ApiProperty({ enum: GenreType, required: false })
-    @IsOptional()
+    @ApiProperty({ enum: GenreType })
     @IsEnum(GenreType)
-    gender?: GenreType;
+    @IsNotEmpty()
+    gender: GenreType;
 
     @ApiProperty({ example: '2018-06-24', required: false })
     @ValidateIf(o => o.status !== StatutEnfantType.A_NAITRE)