tree a95ff9c33ac539b1cf43b9629a03fce5616d9610
parent 20ac8096f902549cf0b47b5cb539cfff7235cf96
author James Zern <jzern@google.com> 1552037973 -0800
committer James Zern <jzern@google.com> 1552066121 -0800

webm_info: avoid null deref w/track->GetCodecId()

check pointer value before converting to string

BUG=webm:1605

Change-Id: I81c1d90517e12c90fc1e3c3c753e273360c9de38