Tim Na 203b549ee2 Using nullopt when connection is nullptr.
During SelectConnectionToPing, optional connection had the value of nullptr which led the code to crash.

Bug: None
Change-Id: Ibe9a54b71bbd62f3b80d676ca80d64ff951dda51
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/206081
Commit-Queue: Tim Na <natim@webrtc.org>
Reviewed-by: Jonas Oreland <jonaso@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#33197}
2021-02-08 19:13:00 +00:00
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