trace-viewer: Don't let optional features block import
trace-viewer: Don't let optional features block import

Currently if auditor and user model building (which determines various
rail stages) fail, the whole import fails. Not everyone cares about
these features, and we came across a case where an auditor was failing
because a process had two compositor threads. This CL unblocks the
import and just emits a console error.

Change-Id: Ic9ebe4198902ce9767394a3f3baf6ab1e7373be3
Reviewed-on: https://chromium-review.googlesource.com/c/catapult/+/2733073
Reviewed-by: Primiano Tucci <e9b04886ef604b89ec1f7c6dafa5a9a6f31d533e@chromium.org>
Commit-Queue: Deep Roy <196de8ecef43ff77ba1a773ccd52374e3849c302@chromium.org>
Auto-Submit: Deep Roy <196de8ecef43ff77ba1a773ccd52374e3849c302@chromium.org>

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