Fix psalm issues

[Tigrov]

Q	A
Is bugfix?	❌
New feature?	❌
Breaks BC?	❌
Fixed issues	-

[what-the-diff]

PR Summary

• Refinement of checks in DDLQueryBuilder.php
  The criteria used to check for empty strings and null values in various methods of this file were refined. This ensures more accurate detection and handling of these cases.

• Improved checking mechanism in DMLQueryBuilder.php
  The checks for empty arrays were fine-tuned within two methods. This refinement improves the accuracy in handling scenarios where records are being inserted or updated.

• Enhanced value checking in Schema.php
  Several methods within this file received modifications to the way they detect and handle empty value cases. By doing so, they should now accurately handle various situations involving extra column info, default column values and json columns. This can increase the stability of operations involving database schemas.

• Modified pattern matching in DDLQueryBuilder.php and Schema.php
  Two methods, one in each file, had their regular expression pattern matching specifically modified. The adjustment made improves the accuracy of column and index detecting processes. A more accurate detection can help prevent undesired side effects. All these changes refine the way the system works with the database, thus improving the overall system stability and effectiveness.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (fa3c327) 99.04% compared to head (320d7bf) 99.04%.

❗ Current head 320d7bf differs from pull request most recent head dd20ed0. Consider uploading reports for the commit dd20ed0 to get more accurate results

Additional details and impacted files

@@            Coverage Diff            @@
##             master     #319   +/-   ##
=========================================
  Coverage     99.04%   99.04%           
  Complexity      174      174           
=========================================
  Files            13       13           
  Lines           524      524           
=========================================
  Hits            519      519           
  Misses            5        5           

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[darkdef]

Move refactoring to other PR

[Tigrov]

Move refactoring to other PR

Done