Notify alerts list about failed reindexing task.
Rescue StandardError instead of Exception.
Add national footnote for codes under heading 3826.
Merge pull request #63 from alphagov/tariff_reindexer_exception_catching

Notify alerts list about failed reindexing task.
Merge pull request #64 from alphagov/new_national_footnote_05976

Add national footnote for codes under heading 3826.