fix https://github.com/sagemathinc/cocalc/issues/3456 -- sync: _syncdb_cursor_activity → process → Cannot read property 'equals' of undefined
fix https://github.com/sagemathinc/cocalc/issues/3456 -- sync: _syncdb_cursor_activity → process → Cannot read property 'equals' of undefined

tscholl2/smc,tscholl2/smc,tscholl2/smc,DrXyzzy/smc,sagemathinc/smc,DrXyzzy/smc,sagemathinc/smc,sagemathinc/smc,DrXyzzy/smc,DrXyzzy/smc,tscholl2/smc,tscholl2/smc,sagemathinc/smc