web/admin: fix error when prompt previewing fails when loading the page

[BeryJu]

No description provided.

[codecov]

Codecov Report

Patch coverage has no change and project coverage change: -0.45 ⚠️

Comparison is base (f441753) 92.71% compared to head (1a3d1f7) 92.25%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #5290      +/-   ##
==========================================
- Coverage   92.71%   92.25%   -0.45%     
==========================================
  Files         506      506              
  Lines       25867    25867              
==========================================
- Hits        23980    23862     -118     
- Misses       1887     2005     +118     

Flag	Coverage Δ
e2e	51.03% <ø> (-1.68%)	⬇️
integration	26.34% <ø> (ø)
unit	89.54% <ø> (ø)

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see 21 files with indirect coverage changes

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