fix schema for empty array (#63)

Author: fredericobraga85

src/api-utils/schemas/user.ts

@@ -17,7 +17,7 @@ const userSessionSchema = Joi.object({
   profilePictureUrl: Joi.string().allow(null).optional(),
   role: Joi.number().required(),
   isAdmin: Joi.boolean().required(),
-  capabilities: Joi.array().items(Joi.string().required()).required(),
+  capabilities: Joi.array().items(Joi.string()).required(),
 }).options({ stripUnknown: true });
 
 export const sessionSchema = Joi.object({