fix(engine): do not panic reporting an empty activity (#438)

Author: agneum

engine/internal/retrieval/engine/postgres/physical/physical.go

@@ -165,7 +165,7 @@ func (r *RestoreJob) Reload(cfg map[string]interface{}) (err error) {
 
 // ReportActivity reports the current job activity.
 func (r *RestoreJob) ReportActivity(_ context.Context) (*activity.Activity, error) {
-	return nil, nil
+	return &activity.Activity{}, nil
 }
 
 // Run starts the job.

engine/internal/retrieval/engine/postgres/snapshot/logical.go

@@ -116,7 +116,7 @@ func (s *LogicalInitial) Reload(cfg map[string]interface{}) (err error) {
 
 // ReportActivity reports the current job activity.
 func (s *LogicalInitial) ReportActivity(_ context.Context) (*activity.Activity, error) {
-	return nil, nil
+	return &activity.Activity{}, nil
 }
 
 // Run starts the job.

engine/internal/retrieval/engine/postgres/snapshot/physical.go

@@ -281,7 +281,7 @@ func (p *PhysicalInitial) reloadScheduler() {
 
 // ReportActivity reports the current job activity.
 func (p *PhysicalInitial) ReportActivity(_ context.Context) (*activity.Activity, error) {
-	return nil, nil
+	return &activity.Activity{}, nil
 }
 
 // Run starts the job.