Query trace retrieval fails when started_at is null

Description

This is very hard to reproduce, but appeared on Jenkins with C* 2.1 (I've only seen it once), so here it is.

The started_at cell value from the system_traces.sessions table can be null, after duration is not null or at least that is what is shown on the exception (mono):

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Joao Reis
February 18, 2019, 11:28 AM

Adding more info:

Just saw this error in a nightly build today (February 18th). It happened in the following test running against dse-4.8 with netstandard2.0 target:
Policies.Tests.LoadBalancingPolicyShortTests.TokenAware_Guid_NoHops

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Jorge Bay Gondra

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