User deletion now also delete's the users permissons

ref #6

src/models/entities/Principal.ts

@@ -1,4 +1,4 @@
-import { IsInt, IsOptional } from 'class-validator';
+import { IsInt } from 'class-validator';
 import { Entity, OneToMany, PrimaryGeneratedColumn, TableInheritance } from 'typeorm';
 import { ResponsePrincipal } from '../responses/ResponsePrincipal';
 import { Permission } from './Permission';
@@ -19,9 +19,8 @@ export abstract class Principal {
   /**
 * permissions
 */
-  @IsOptional()
   @OneToMany(() => Permission, permission => permission.principal, { nullable: true })
-  permissions?: Permission[];
+  permissions: Permission[];
 
   public abstract toResponse(): ResponsePrincipal;
 }