In Differential mail, hide "summary" if empty and show "test plan" if nonempty
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Description

In Differential mail, hide "summary" if empty and show "test plan" if nonempty

Summary:
Ref T4481. Summary is optional, but we currently always render it.

We previously rendered TEST PLAN. I wanted to see if anyone missed it. I miss it a little bit, and it sounds like @spicyj misses it. Restore it.

Test Plan:

$ ./bin/mail show-outbound --id 15232
...
BODY
epriestley created this revision.
epriestley added reviewers: The Bureaucracy, duck.
epriestley added a subscriber: duck.

TEST PLAN
  more j

REVISION DETAIL
  http://local.aphront.com:8080/D1042

AFFECTED FILES
  number_j.txt

CHANGE DETAILS
  Index: number_j.txt
  ===================================================================
  --- number_j.txt
  +++ number_j.txt
  @@ -137,3 +137,4 @@
   j
   j
   j
  +j

To: epriestley, duck, Sebastiangarcia, Ahmedsmoore, nathanhthomas, chewnicorn
Cc: duck