add password as optional

src/vistor-password/dtos/temp-pass.dto.ts

@@ -248,10 +248,10 @@ export class AddDoorLockTemporaryPasswordDto {
 
   @ApiProperty({
     description: 'password',
-    required: true,
+    required: false,
   })
   @IsString()
-  @IsNotEmpty()
+  @IsOptional()
   @Length(7, 7)
   public password: string;