Empty ExpressionAttributeValues generated when using conditions

[aldebout]

I tried to do

MyEntity.delete(
  {
    pk,
    sk,
  },
  { conditions: { attr: 'username', exists: true } },
)

but I'm getting ExpressionAttributeValues must not be empty because the generated params are

{ TableName: '',
  Key:
   { PK: '',
     SK: '' },
  ExpressionAttributeNames: { '#attr1': 'username' },
  ExpressionAttributeValues: {},
  ConditionExpression: 'attribute_exists(#attr1)' }

I'm not 100% sure my use case is valid DDB but this might be on the library ;)

[BDQ]

I'm seeing the same error, with a put when using exists: false as the only condition.

[jeremydaly]

This was resolved by a fix for #51.