reduce memory allocation when possible

[artur-chopikian]

PR Details

Redure memory allocation

Description

Skip xml encoding when string is empty

Related Issue

Do not know about it

Motivation and Context

Reduce memory usage

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 99.20%. Comparing base (5264285) to head (cf75c52).
Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #2096   +/-   ##
=======================================
  Coverage   99.20%   99.20%           
=======================================
  Files          32       32           
  Lines       30070    30070           
=======================================
  Hits        29832    29832           
  Misses        158      158           
  Partials       80       80           

Flag	Coverage Δ
unittests	99.20% <100.00%> (ø)

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[xuri]

LGTM, thanks for your contribution.