protect against null values

src/metabase/models/field.clj

@@ -115,7 +115,7 @@
         :table                     (delay (sel :one 'metabase.models.table/Table :id table_id))
         :db                        (delay @(:db @(:table <>)))
         :target                    (delay (field->fk-field field))
-        :human_readable_name       (when (name :field)
+        :human_readable_name       (when (not (nil? (name :field)))
                                      (delay (common/name->human-readable-name (:name field))))
         :parent                    (when parent_id
                                      (delay (this parent_id)))

src/metabase/models/table.clj

@@ -40,7 +40,7 @@
                                (sel :many :field->field [FieldValues :field_id :values] :field_id [in field-ids])))
        :description         (u/jdbc-clob->str description)
        :pk_field            (delay (:id (sel :one :fields [Field :id] :table_id id (where {:special_type "id"}))))
-       :human_readable_name (when (:name table)
+       :human_readable_name (when (not (nil? (:name table)))
                               (delay (common/name->human-readable-name (:name table)))))))
 
   (pre-cascade-delete [_ {:keys [id] :as table}]