do not audit empty user

[vangheem]

Description

Do not audit when no user is provided.

How was this PR tested?

Describe how you tested this PR.

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Comparison is base (40663e4) 81.34% compared to head (d53f1a3) 81.83%. Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1672      +/-   ##
==========================================
+ Coverage   81.34%   81.83%   +0.48%     
==========================================
  Files         332      332              
  Lines       19254    19288      +34     
==========================================
+ Hits        15663    15785     +122     
+ Misses       3591     3503      -88     

Flag	Coverage Δ
ingest	69.14% <ø> (ø)
nucliadb	70.47% <100.00%> (+0.47%)	:arrow_up:
reader	76.90% <ø> (ø)
sdk	40.52% <ø> (ø)
search	79.15% <100.00%> (+0.46%)	:arrow_up:
standalone	81.40% <ø> (ø)
train	63.36% <ø> (ø)
utils	81.24% <ø> (-0.05%)	:arrow_down:
writer	85.69% <ø> (+0.69%)	:arrow_up:

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