Fix some bugs in AlignedTVListIterator

[shuwenwei]

Description

Fix some bugs in AlignedTVListIterator. In the tree model, some all-null rows may be found unexpectedly.

IoTDB> insert into root.test.d1(time,s1,s2) aligned values (1,1,1)
Msg: The statement is executed successfully.
IoTDB> insert into root.test.d1(time,s1) aligned values (2,2)
Msg: The statement is executed successfully.
IoTDB> insert into root.test.d1(time,s2) aligned values (3,3)
Msg: The statement is executed successfully.
IoTDB> flush
Msg: The statement is executed successfully.
IoTDB> insert into root.test.d1(time,s1,s2) aligned values (1,1,1)
Msg: The statement is executed successfully.
IoTDB> insert into root.test.d1(time,s1) aligned values (2,2)
Msg: The statement is executed successfully.
IoTDB> insert into root.test.d1(time,s2) aligned values (3,3)
Msg: The statement is executed successfully.
IoTDB> select s1 from root.test.d1
+-----------------------------+---------------+
|                         Time|root.test.d1.s1|
+-----------------------------+---------------+
|1970-01-01T08:00:00.001+08:00|            1.0|
|1970-01-01T08:00:00.002+08:00|            2.0|
|1970-01-01T08:00:00.003+08:00|           null|
+-----------------------------+---------------+
Total line number = 3
It costs 0.225s

[sonarqubecloud]

Quality Gate passed

Issues
8 New issues
0 Accepted issues

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

See analysis details on SonarQube Cloud

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 38.85%. Comparing base (aaf5139) to head (0095c09).
⚠️ Report is 4 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff              @@
##             master   #16318      +/-   ##
============================================
- Coverage     38.86%   38.85%   -0.01%     
  Complexity      198      198              
============================================
  Files          4910     4910              
  Lines        322518   322524       +6     
  Branches      40925    40926       +1     
============================================
- Hits         125335   125330       -5     
- Misses       197183   197194      +11     

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