[PR] Fix validation logic in `StructArray::try_new` to account for array.logical_nulls() returning Some() and null_count == 0 [arrow-rs]

[via GitHub]

phillipleblanc opened a new pull request, #7436:
URL: https://github.com/apache/arrow-rs/pull/7436

   # Which issue does this PR close?
   
   - Closes #7435
   
   # Rationale for this change
    
   Fixes the validation logic in StructArray::try_new to not error if there 
aren't any unmasked nulls, but `a.logical_nulls()` returns Some
   
   # What changes are included in this PR?
   
   A single line change to check for `null_count()` on the `NullBuffer` before 
comparing against the parent nulls.
   
   # Are there any user-facing changes?
   
   No
   


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