[events/encoding] Catch a utf-8 encoding error in event parsing.
[events/encoding] Catch a utf-8 encoding error in event parsing.

Summary:
UTF-8 encoding error.

Fixes T389

Test Plan: Check the code to make sure utf-8 encoding is on the right string.

Reviewers: spang

Reviewed By: spang

Maniphest Tasks: T389

Differential Revision: https://review.inboxapp.com/D407

gale320/sync-engine,closeio/nylas,PriviPK/privipk-sync-engine,jobscore/sync-engine,wakermahmud/sync-engine,gale320/sync-engine,EthanBlackburn/sync-engine,Eagles2F/sync-engine,PriviPK/privipk-sync-engine,closeio/nylas,closeio/nylas,wakermahmud/sync-engine,Eagles2F/sync-engine,PriviPK/privipk-sync-engine,nylas/sync-engine,EthanBlackburn/sync-engine,jobscore/sync-engine,gale320/sync-engine,gale320/sync-engine,EthanBlackburn/sync-engine,jobscore/sync-engine,Eagles2F/sync-engine,ErinCall/sync-engine,ErinCall/sync-engine,wakermahmud/sync-engine,jobscore/sync-engine,PriviPK/privipk-sync-engine,ErinCall/sync-engine,wakermahmud/sync-engine,Eagles2F/sync-engine,Eagles2F/sync-engine,PriviPK/privipk-sync-engine,closeio/nylas,nylas/sync-engine,wakermahmud/sync-engine,gale320/sync-engine,EthanBlackburn/sync-engine,ErinCall/sync-engine,ErinCall/sync-engine,EthanBlackburn/sync-engine,nylas/sync-engine,nylas/sync-engine