Adopting table throws array_keys warning in data_search_get_fields

When adopting a table, the following warnings are logged in watchdog:

Warning: array_keys() expects parameter 1 to be array, null given in data_search_get_fields() (line 187
Warning: Invalid argument supplied for foreach() in data_search_get_fields() (line 187 of

Multiple mentions of this behavior in this issue: https://www.drupal.org/node/1630924