tree 2cc523537eb989b3db2aa2a1256929459348c229
parent 2ae9db8f246b258b65f92a67fd96c177484b7946
author martinduke <martinduke@google.com> 1791935641 -0700
committer Copybara-Service <copybara-worker@google.com> 1791935693 -0700

MOQT: Check for nullptr in GetStreamById().

visitor()->session() is deliberately nullptr when closing.

PiperOrigin-RevId: 998979542