Fix object prop default to empty object

...avascripts/cycle_analytics/components/path_navigation.vue

...pts/issue_show/components/fields/description_template.vue

app/assets/javascripts/issue_show/components/form.vue

..._search_and_tabs/paginated_table_with_search_and_tabs.vue

...rt/devops_adoption/components/devops_adoption_section.vue

...lytics/productivity_analytics/components/metric_chart.vue

...liance_dashboard/components/drawer_sections/merged_by.vue

...cripts/escalation_policies/components/escalation_rule.vue

...ipts/related_items_tree/components/epic_health_status.vue