[alert sub view] Fix bug where hovering over analysis link caused error
[alert sub view] Fix bug where hovering over analysis link caused error

This was the result of passing an actual event as the selection into
the analysis link rather than an EventSet that contained the selection.

(All selections should be event sets.)

BUG=catapult:#2469

Review-Url: https://codereview.chromium.org/2143153003

benschmaus/catapult,sahiljain/catapult,sahiljain/catapult,catapult-project/catapult,catapult-project/catapult-csm,catapult-project/catapult-csm,catapult-project/catapult,benschmaus/catapult,sahiljain/catapult,sahiljain/catapult,catapult-project/catapult-csm,catapult-project/catapult-csm,benschmaus/catapult,benschmaus/catapult,catapult-project/catapult,benschmaus/catapult,catapult-project/catapult,catapult-project/catapult,catapult-project/catapult-csm,catapult-project/catapult-csm,sahiljain/catapult,catapult-project/catapult-csm,catapult-project/catapult,benschmaus/catapult,benschmaus/catapult,sahiljain/catapult,catapult-project/catapult