FakeDynamo cannot find local index if there are no conditions

[kylewm]

If I build a query with an index name but without any filter conditons, e.g.

new QueryBuilder()
  .setTableName('Users')
  .setHashKey('userId', ...)
  .setIndexName('isAdmin-index')
  .execute()

FakeDynamo doesn't know which attribute that corresponds to

FakeTable.prototype.query = function(data) {
  var indexedKeyName
  if (data.IndexName) {
    // Global Secondary Index if the index name has three or more
    // parts (separated by '-')
    var indexParts = data.IndexName.split('-')
    var probableGSIIndex = indexParts.length >= 3
    if (probableGSIIndex) {
      return this._queryGlobalSecondaryIndex(data)
    }

    // Extract the range key for Local Secondary Indexes
    for (var key in data.KeyConditions) {
      if (key !== this.primaryKey.hash.name) {
        indexedKeyName = key
      }
    }
  }
  ...

and (silently) fails to find anything as a result.