Fix tag empty error and disorder timestamp.

[ColinLeeo]

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 85.95041% with 17 lines in your changes missing coverage. Please review.

Project coverage is 65.77%. Comparing base (2995362) to head (486017c). Report is 2 commits behind head on develop.

Files with missing lines	Patch %	Lines
cpp/src/common/tsblock/tsblock.cc	0.00%	4 Missing :warning:
cpp/src/common/allocator/byte_stream.h	82.35%	3 Missing :warning:
cpp/src/common/device_id.h	94.82%	3 Missing :warning:
cpp/src/common/tsfile_common.h	60.00%	1 Missing and 1 partial :warning:
cpp/src/reader/qds_with_timegenerator.cc	0.00%	2 Missing :warning:
cpp/src/common/allocator/my_string.h	66.66%	1 Missing :warning:
cpp/src/common/tablet.cc	90.90%	0 Missing and 1 partial :warning:
...p/src/reader/block/single_device_tsblock_reader.cc	85.71%	0 Missing and 1 partial :warning:

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #489      +/-   ##
===========================================
+ Coverage    65.70%   65.77%   +0.06%     
===========================================
  Files          566      566              
  Lines        33360    33430      +70     
  Branches      4664     4688      +24     
===========================================
+ Hits         21919    21987      +68     
- Misses       10789    10790       +1     
- Partials       652      653       +1     

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