Don't throw an error when a partial permissions graph revision has no new changes

[noahmoss]

Resolves #25221

[codecov[bot]]

Codecov Report

Base: 64.14% // Head: 64.14% // Increases project coverage by +0.00% :tada:

Coverage data is based on head (d74dff2) compared to base (590759f). Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@           Coverage Diff           @@
##           master   #26097   +/-   ##
=======================================
  Coverage   64.14%   64.14%           
=======================================
  Files        3103     3103           
  Lines       91531    91532    +1     
  Branches    11538    11539    +1     
=======================================
+ Hits        58711    58712    +1     
+ Misses      28200    28199    -1     
- Partials     4620     4621    +1     

Flag	Coverage Δ
back-end	85.55% <100.00%> (+<0.01%)	:arrow_up:
front-end	44.75% <ø> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
src/metabase/models/permissions.clj	83.95% <100.00%> (+0.03%)	:arrow_up:
src/metabase/models/query.clj	92.30% <0.00%> (ø)

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