[ISSUE #9765] Improve null handling in file operations

[yx9o]

Fixes #9765 .

[codecov-commenter]

Codecov Report

❌ Patch coverage is 66.66667% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 48.21%. Comparing base (e6ec760) to head (2f63e92).
⚠️ Report is 1 commits behind head on develop.

Files with missing lines	Patch %	Lines
.../main/java/org/apache/rocketmq/common/UtilAll.java	66.66%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@              Coverage Diff              @@
##             develop    #9766      +/-   ##
=============================================
- Coverage      48.35%   48.21%   -0.14%     
+ Complexity     12201    12155      -46     
=============================================
  Files           1313     1313              
  Lines          93340    93341       +1     
  Branches       11962    11963       +1     
=============================================
- Hits           45139    45009     -130     
- Misses         42632    42737     +105     
- Partials        5569     5595      +26     

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