tree bc52fc4da1f35a37e7bab6f1430a577c91c57e63
parent 9cb85b78914e7c3b613b280d5080d5d1b72371a7
author fayang <fayang@google.com> 1609357765 -0800
committer Copybara-Service <copybara-worker@google.com> 1609357809 -0800

Fix QUIC_BUG in FlushAckFrame to check whether frames is empty.

Protected by FLAGS_quic_reloadable_flag_quic_single_ack_in_packet2.

PiperOrigin-RevId: 349583801
Change-Id: I75958100168a1c77c8661d217224f6584fac284c