Keep all null rows in table model flush

[HTHou]

Description

As title. Refer #13487.

[sonarcloud]

Quality Gate failed

Failed conditions
36.1% Duplication on New Code (required ≤ 3%)
C Reliability Rating on New Code (required ≥ A)

See analysis details on SonarCloud

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 39.84%. Comparing base (576b6d5) to head (efea121).
Report is 5 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff            @@
##             master   #13883   +/-   ##
=========================================
  Coverage     39.83%   39.84%           
  Complexity       71       71           
=========================================
  Files          4153     4153           
  Lines        262907   262957   +50     
  Branches      32014    32020    +6     
=========================================
+ Hits         104727   104767   +40     
- Misses       158180   158190   +10     

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