SES-128 Add ErrorResponse

SessionCompanion/SessionCompanion/Controllers/WeaponController.cs

@@ -23,9 +23,16 @@ namespace SessionCompanion.Controllers
         /// </summary>
         /// <returns>Lista wszystkich broni w bazie danych</returns>
         [HttpGet("getAllWeapons")]
-        public async Task<List<WeaponViewModel>> GetWeapons() 
+        public async Task<Either<List<WeaponViewModel>, ErrorResponse>> GetWeapons() 
         {
-            return _service.Get().ToList();
+            var weapons = _service.Get().ToList();
+            if (!weapons.Any())
+                return new ErrorResponse()
+                {
+                    StatusCode = 204,
+                    Message = "No weapons in database"
+                };
+            return weapons;
         }
     }
 }