fix(alerts): Show empty state for projects column when no detectors connected

When an automation has no connected detectors, the projects column
showed all projects because useDetectorsQuery({ids: []}) fetched all
detectors. Disable the query when detectorIds is empty and show an
em-dash empty state instead.

Fixes ISWF-2161

Author: malwilley

static/app/views/automations/components/automationListTable/row.tsx

@@ -9,6 +9,7 @@ import {ProjectList} from 'sentry/components/projectList';
 import {SimpleTable} from 'sentry/components/tables/simpleTable';
 import {ActionCell} from 'sentry/components/workflowEngine/gridCell/actionCell';
 import {AutomationTitleCell} from 'sentry/components/workflowEngine/gridCell/automationTitleCell';
+import {EmptyCell} from 'sentry/components/workflowEngine/gridCell/emptyCell';
 import {TimeAgoCell} from 'sentry/components/workflowEngine/gridCell/timeAgoCell';
 import {ProjectsStore} from 'sentry/stores/projectsStore';
 import type {Automation} from 'sentry/types/workflowEngine/automations';
@@ -66,7 +67,11 @@ export function AutomationListRow({
         <ActionCell actions={actions} disabled={!enabled} />
       </SimpleTable.RowCell>
       <SimpleTable.RowCell data-column-name="projects">
-        <ProjectList projectSlugs={projectSlugs} />
+        {projectSlugs.length > 0 ? (
+          <ProjectList projectSlugs={projectSlugs} />
+        ) : (
+          <EmptyCell />
+        )}
       </SimpleTable.RowCell>
       <SimpleTable.RowCell data-column-name="connected-monitors">
         <AutomationListConnectedDetectors detectorIds={detectorIds} />

static/app/views/automations/hooks/utils.tsx

@@ -53,7 +53,10 @@ export function getAutomationActionsWarning(
 }
 
 export function useAutomationProjectIds(automation: Automation): string[] {
-  const {data: detectors} = useDetectorsQuery({ids: automation.detectorIds});
+  const {data: detectors} = useDetectorsQuery(
+    {ids: automation.detectorIds},
+    {enabled: automation.detectorIds.length > 0}
+  );
   return [
     ...new Set(detectors?.map(detector => detector.projectId).filter(x => x) ?? []),
   ] as string[];