fix(donations): Fixed creation bug

src/models/actions/create/CreateDistanceDonation.ts

@@ -1,4 +1,4 @@
-import { IsInt, IsPositive } from 'class-validator';
+import { IsInt, IsOptional, IsPositive } from 'class-validator';
 import { getConnection } from 'typeorm';
 import { RunnerNotFoundError } from '../../../errors/RunnerErrors';
 import { DistanceDonation } from '../../entities/DistanceDonation';
@@ -22,6 +22,7 @@ export class CreateDistanceDonation extends CreateDonation {
      * The donation's paid amount in the smalles unit of your currency (default: euro cent).
      */
     @IsInt()
+    @IsOptional()
     paidAmount?: number;
 
     /**