refact: post review changes

Author: karitra

isolate/initialdispatch.go

@@ -63,15 +63,15 @@ func readStringsSlice(r *msgp.Reader) (uuids []string, err error) {
 
 	sz, err = r.ReadArrayHeader()
 	if err != nil {
-		return uuids, err
+		return
 	}
 
 	for i := uint32(0); i < sz; i++ {
 		var u string
 		if u, err = r.ReadString(); err == nil {
 			uuids = append(uuids, u)
 		} else {
-			return uuids, err
+			return
 		}
 	}
 
@@ -326,11 +326,6 @@ func (d *initialDispatch) onWorkersMetrics(uuidsQuery []string) (Dispatcher, err
 			err error
 		)
 
-		if d == nil {
-			log.G(d.ctx).Error("strange: dispatch is `nil`")
-			return
-		}
-
 		if err = msgp.Encode(&buf, &metrics); err != nil {
 			log.G(d.ctx).WithError(err).Errorf("unable to encode containers metrics response: %v", err)
 			d.stream.Error(d.ctx, replyMetricsError, errMarshallingError, err.Error())