Fixed key null constraint

ref #104

src/models/entities/Address.ts

@@ -1,6 +1,4 @@
 import {
-  IsNotEmpty,
-  IsOptional,
   IsPostalCode,
   IsString
 } from "class-validator";
@@ -18,10 +16,9 @@ export class Address {
    * The address's first line.
    * Containing the street and house number.
    */
-  @Column()
+  @Column({ nullable: true })
   @IsString()
-  @IsNotEmpty()
-  address1: string;
+  address1?: string;
 
   /**
    * The address's second line.
@@ -29,33 +26,29 @@ export class Address {
    */
   @Column({ nullable: true })
   @IsString()
-  @IsOptional()
   address2?: string;
 
   /**
    * The address's postal code.
    * This will get checked against the postal code syntax for the configured country.
    */
-  @Column()
+  @Column({ nullable: true })
   @IsString()
-  @IsNotEmpty()
   @IsPostalCode(config.postalcode_validation_countrycode)
   postalcode: string;
 
   /**
    * The address's city.
    */
-  @Column()
+  @Column({ nullable: true })
   @IsString()
-  @IsNotEmpty()
   city: string;
 
   /**
    * The address's country.
    */
-  @Column()
+  @Column({ nullable: true })
   @IsString()
-  @IsNotEmpty()
   country: string;
 
   public reset() {