solver: address MR comment

Author: soluwalana

solver/exporter.go

@@ -129,12 +129,7 @@ func (e *exporter) ExportTo(ctx context.Context, t CacheExporterTarget, opt Cach
 		res, err := cm.backend.Load(key, v.ID)
 		if err != nil {
 			if errors.Is(err, ErrNotFound) {
-				if i < len(records) {
-					v = records[i]
-					i++
-				} else {
-					break
-				}
+				v = nil
 				continue
 			}
 			return nil, err