Fix Command::insertWithReturningPks()

[Tigrov]

Related PR:

• Test Command::insertWithReturningPks() with empty values db#791

Q	A
Is bugfix?	✔️
New feature?	❌
Breaks BC?	❌
Fixed issues	yiisoft/db#792

[what-the-diff]

PR Summary

• Enhanced Data Validation
  We have made a significant update to the insertWithReturningPks function within the Command.php file. Specifically, we have added a safeguard that checks for columns returning empty data. This is important because it ensures that the data we're working with is complete, aiding the reliability and accuracy of our operations.

[codecov]

Codecov Report

Attention: 1 lines in your changes are missing coverage. Please review.

Comparison is base (1ae3f3d) 98.40% compared to head (86eac6c) 98.23%.

Files	Patch %	Lines
src/Command.php	83.33%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master     #250      +/-   ##
============================================
- Coverage     98.40%   98.23%   -0.17%     
- Complexity      175      177       +2     
============================================
  Files            16       16              
  Lines           564      568       +4     
============================================
+ Hits            555      558       +3     
- Misses            9       10       +1     

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