enh: avoid stmt init when no parameters

[huskar-t]

Description

Please briefly describe the code changes in this pull request.

Checklist

Please check the items in the checklist if applicable.

• Is the user manual updated?
• Are the test cases passed and automated?
• Is there no significant decrease in test coverage?

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 75.00000% with 2 lines in your changes missing coverage. Please review.

Project coverage is 73.95%. Comparing base (c83bad8) to head (1e0ca25).

Files with missing lines	Patch %	Lines
src/Data/Client/TDengineCommand.cs	75.00%	0 Missing and 2 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##              3.0     #106      +/-   ##
==========================================
- Coverage   73.96%   73.95%   -0.01%     
==========================================
  Files         104      104              
  Lines        5112     5114       +2     
  Branches      453      454       +1     
==========================================
+ Hits         3781     3782       +1     
  Misses       1161     1161              
- Partials      170      171       +1     

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