closes #1999,fix GetCellRichText strconv.Atoi error because of null value (#1999)

[liuwangchao]

PR Details

fix GetCellRichText strconv.Atoi error because of null value

Description

Related Issue

#1999

Motivation and Context

How Has This Been Tested

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 99.32%. Comparing base (41c7dd3) to head (cda5a4a).
Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #2000   +/-   ##
=======================================
  Coverage   99.32%   99.32%           
=======================================
  Files          32       32           
  Lines       25332    25332           
=======================================
  Hits        25160    25160           
  Misses         92       92           
  Partials       80       80           

Flag	Coverage Δ
unittests	99.32% <100.00%> (ø)

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[xuri]

LGTM, thanks for your contribution. I made some changes and added unit tests based on your branch.

[liuwangchao]

So fast👍, and it's my pleasure