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Remove extra container tag on HandleListViews rendering from…

Description

Remove extra container tag on HandleListViews rendering from ModularTransactions in text mode

Summary:
Fixes T12082. Ref T11114. When modular transaction render a handle list, they use HandleListView, which has a text mode.

However, the HandleListView is a TagView, and currently TagViews always render a tag of some kind. Allow them to return null to decline to render any tag.

Test Plan:

  • Added a pile of debugging stuff to ApplicationTransactionEditor to throw during mail generation.
  • Added a reviewer to a revision.
  • Used bin/worker execute --id ... to hit the mail generation repeatedly.
  • Before patch: mail generated with a <span>, even in text mode.
  • After patch: clean mail generation.

Reviewers: chad

Reviewed By: chad

Maniphest Tasks: T12082, T11114

Differential Revision: https://secure.phabricator.com/D17162