Fix #1409 - Client thumbprint should not be present in device twin if…

[kbeaugrand]

… empty

Description

What's new?

• Fix Bug: When not specifying a concentrator thumbprint, empty string is added in twin #1409

What kind of change does this PR introduce?

• Bugfix
• Feature
• Code style update (formatting, local variables)
• Refactoring (no functional changes, no api changes)
• Build related changes
• CI related changes
• Documentation content changes
• Tests
• Other

[codecov]

Codecov Report

Base: 89.59% // Head: 89.59% // No change to project coverage 👍

Coverage data is based on head (4d902da) compared to base (4d902da).
Patch has no changes to coverable lines.

❗ Current head 4d902da differs from pull request most recent head 4b27599. Consider uploading reports for the commit 4b27599 to get more accurate results

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1470   +/-   ##
=======================================
  Coverage   89.59%   89.59%           
=======================================
  Files         256      256           
  Lines        8064     8064           
=======================================
  Hits         7225     7225           
  Misses        839      839           

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