message: Add performance optimization for empty `RtpPacketInfos`.
  Cr-Commit-Position: refs/heads/master@{#28653}
diff: @@ -76,6 +76,11 @@ class RtpPacketInfos {
  class Data : public rtc::RefCountedBase {
  public:
  static rtc::scoped_refptr<Data> Create(vector_type entries) {
  + // Performance optimization for the empty case.
  + if (entries.empty()) {
  + return nullptr;
  + }
  +
  return new Data(entries);
  }
  