Handle case where owner is null

[SchrodingersGat]

No description provided.

[netlify]

✅ Deploy Preview for inventree-web-pui-preview canceled.

Name	Link
🔨 Latest commit	ddb8fab
🔍 Latest deploy log	https://app.netlify.com/projects/inventree-web-pui-preview/deploys/683e84e02fff0a0008f2304d

[codecov]

Codecov Report

Attention: Patch coverage is 66.66667% with 1 line in your changes missing coverage. Please review.

Project coverage is 86.35%. Comparing base (6d47a0d) to head (ddb8fab).
Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
src/backend/InvenTree/users/models.py	66.66%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #9732   +/-   ##
=======================================
  Coverage   86.35%   86.35%           
=======================================
  Files        1230     1230           
  Lines       53960    53962    +2     
  Branches     2255     2255           
=======================================
+ Hits        46596    46600    +4     
+ Misses       6794     6792    -2     
  Partials      570      570           

Flag	Coverage Δ
backend	88.31% <66.66%> (+<0.01%)	⬆️

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[github-actions]

💚 All backports created successfully

Status	Branch	Result
✅	0.17.x

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