Fix query error after insert an all null aligned tablet and flush

[HTHou]

Description

As title.

How To Test.

// Insert aligned tablet with null values
String deviceId = "root.sg1.clsu.aligned_d1";
Tablet tablet =
    new Tablet(
        deviceId,
        Arrays.asList(
            new MeasurementSchema("s1", TSDataType.BOOLEAN),
            new MeasurementSchema("s2", TSDataType.INT32)),
        3);
tablet.addTimestamp(0, 300);
tablet.addValue("s1", 0, null);
tablet.addValue("s2", 0, null);
tablet.addTimestamp(1, 400);
tablet.addValue("s1", 1, null);
tablet.addValue("s2", 1, null);
tablet.addTimestamp(2, 500);
tablet.addValue("s1", 2, null);
tablet.addValue("s2", 2, null);
session.insertAlignedTablet(tablet);

Then execute

select count(s1) from root.sg1.clsu.aligned_d1

[codecov]

Codecov Report

Attention: Patch coverage is 54.54545% with 5 lines in your changes missing coverage. Please review.

Project coverage is 39.48%. Comparing base (25128fc) to head (1eca24e).
Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
...e/dataregion/memtable/AlignedWritableMemChunk.java	44.44%	5 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff            @@
##             master   #14777   +/-   ##
=========================================
  Coverage     39.48%   39.48%           
  Complexity      193      193           
=========================================
  Files          4482     4482           
  Lines        285114   285122    +8     
  Branches      35322    35326    +4     
=========================================
+ Hits         112584   112590    +6     
- Misses       172530   172532    +2     

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[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

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