fix: return empty activity channels when segment expansion finds no subprojects

Avoid invalid `segmentId IN ()` SQL when project scope expands to zero
active subprojects after moving expansion out of middleware.

Signed-off-by: Yeganathan S <63534555+skwowet@users.noreply.github.com>

Author: skwowet

backend/src/database/repositories/segmentRepository.ts

@@ -296,6 +296,10 @@ class SegmentRepository extends RepositoryBase<
   }
 
   async fetchTenantActivityChannels(segmentIds: string[]) {
+    if (segmentIds.length === 0) {
+      return {}
+    }
+
     const transaction = this.transaction
 
     const records = await this.options.database.sequelize.query(

backend/src/services/activityService.ts

@@ -108,6 +108,10 @@ export default class ActivityService extends LoggerBase {
 
     const subprojectIds = await getSegmentSubprojectIds(qx, currentSegments)
 
+    if (subprojectIds.length === 0) {
+      return {}
+    }
+
     return SegmentService.getTenantActivityChannels(subprojectIds, this.options)
   }