Drush upgrade crashes on loading "is_public" field

Following up from CRM-20318, Karin and Seamus reported that the upgrade fails. Attached is Seamus's backtrace – it appears to indicate that you need some combination of views+webform+ctools to trigger it.

Patch from Seamus: https://github.com/civicrm/civicrm-drupal/pull/444

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#16 /var/local/www/election.greens.org.au/htdocs/profiles/sl_dev/modules/contrib/civicrm/CRM/Core/BAO/CustomGroup.php(537): CRM_Core_DAO::executeQuery("SELECT civicrm_custom_field.id as civicrm_custom_field_id, civicrm_custom_fie...", (A rray:1)) #17 /var/local/www/election.greens.org.au/htdocs/profiles/sl_dev/modules/contrib/civicrm/drupal/modules/views/civicrm.views.inc(308): CRM_Core_BAO_CustomGroup::getTree("Individual", NULL, NULL, "10", NULL, NULL) #18 /var/local/www/election.greens.org.au/htdocs/profiles/sl_dev/modules/contrib/civicrm/drupal/modules/views/components/civicrm.core.inc(2959): civicrm_views_custom_data_cache((Array:146), "Individual", "10", NULL) #19 /var/local/www/election.greens.org.au/htdocs/profiles/sl_dev/modules/contrib/civicrm/drupal/modules/views/civicrm.views.inc(86): _civicrm_core_data((Array:146), (Array:7)) #20 /var/local/www/election.greens.org.au/htdocs/sites/all/modules/views/includes/cache.inc(93): civicrm_views_data_alter((Array:146)) #21 /var/local/www/election.greens.org.au/htdocs/sites/all/modules/views/includes/cache.inc(75): _views_fetch_data_build() #22 /var/local/www/election.greens.org.au/htdocs/sites/all/modules/views/views.module(1293): _views_fetch_data(NULL, TRUE, FALSE) #23 /var/local/www/election.greens.org.au/htdocs/sites/all/modules/contrib/entity/views/entity.views.inc(320): views_fetch_data() #24 /var/local/www/election.greens.org.au/htdocs/sites/all/modules/views/includes/plugins.inc(414): entity_views_plugins() #25 /var/local/www/election.greens.org.au/htdocs/sites/all/modules/views/includes/cache.inc(145): views_discover_plugins() #26 /var/local/www/election.greens.org.au/htdocs/sites/all/modules/views/views.module(1304): _views_fetch_plugin_data("display", "default", FALSE) #27 /var/local/www/election.greens.org.au/htdocs/sites/all/modules/views/includes/view.inc(2335): views_fetch_plugin_data("display", "default") #28 /var/local/www/election.greens.org.au/htdocs/sites/all/modules/views/includes/view.inc(2431): views_db_object->add_display("default", "Master", "default") #29 /var/local/www/election.greens.org.au/htdocs/sites/all/modules/contrib/webform/views/default_views/webform_analysis.inc(21): views_db_object->new_display("default", "Master", "default") #30 /var/local/www/election.greens.org.au/htdocs/sites/all/modules/contrib/webform/webform.module(5075): require_once("/var/local/www/election.greens.org.au/htdocs/sites/all/modules/contrib/webfor...") #31 /var/local/www/election.greens.org.au/htdocs/profiles/sl_dev/modules/contrib/ctools/includes/export.inc(680): webform_views_default_views((Array:24)) #32 /var/local/www/election.greens.org.au/htdocs/profiles/sl_dev/modules/contrib/ctools/includes/export.inc(496): _ctools_export_get_defaults("views_view", (Array:24)) #33 /var/local/www/election.greens.org.au/htdocs/profiles/sl_dev/modules/contrib/ctools/includes/export.inc(148): ctools_export_load_object("views_view", "all") #34 /var/local/www/election.greens.org.au/htdocs/sites/all/modules/views/views.module(1480): ctools_export_crud_load_all("views_view", FALSE) #35 /var/local/www/election.greens.org.au/htdocs/sites/all/modules/views/views.module(1437): views_get_all_views() #36 /var/local/www/election.greens.org.au/htdocs/sites/all/modules/views/views.module(397): views_get_applicable_views("uses hook menu") #37 /var/local/www/election.greens.org.au/htdocs/includes/module.inc(1163): views_menu_alter((Array:1068), NULL, NULL, NULL) #38 /var/local/www/election.greens.org.au/htdocs/includes/menu.inc(2821): drupal_alter("menu", (Array:1068))