[BUG] fix Get Rows function memory issues

[iraj720]

PR Details

fix Get Rows function memory issues that allocate huge amount of memory in special xlsx files

Description

the problem is discussed in the issue
here i just changed it in a way that those empty rows that are located at the end of rows will be ignored

["A", "B", nil, "C", nil, nil] => ["A", "B", nil, "C"]

these nils exist in some special files more than normal
for me was 1 million nils

Related Issue

#1874

Motivation and Context

it was allocating 30Mb of memory for a 10kb file

How Has This Been Tested

discussed in the issue

Types of changes

• Docs change / refactoring / dependency upgrade
• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist

• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have read the CONTRIBUTING document.
• I have added tests to cover my changes.
• All new and existing tests passed.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.21%. Comparing base (5f8a5b8) to head (e098c3a).

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1875   +/-   ##
=======================================
  Coverage   99.21%   99.21%           
=======================================
  Files          32       32           
  Lines       24067    24069    +2     
=======================================
+ Hits        23878    23880    +2     
  Misses        101      101           
  Partials       88       88           

Flag	Coverage Δ
unittests	99.21% <100.00%> (+<0.01%)	⬆️

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[xuri]

LGTM, thanks for your contribution.