CU-8685awfkp fixing server to not return null for oss version

Core/Resgrid.Services/SubscriptionsService.cs

@@ -102,7 +102,7 @@ public async Task<DepartmentPlanCount> GetPlanCountsForDepartmentAsync(int depar
 				return response.Data.Data;
 			}
 
-			return null;
+			return new DepartmentPlanCount();
 		}
 
 		public async Task<Payment> GetCurrentPaymentForDepartmentAsync(int departmentId, bool byPassCache = true)