Cause extraction to fail if it cannot supply all requested tokens

Fixes #119 (closed)

Created by: codecov[bot]

Codecov Report

Merging #120 into master will increase coverage by 0.96%. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #120      +/-   ##
==========================================
+ Coverage   90.38%   91.34%   +0.96%     
==========================================
  Files          38       38              
  Lines        2704     2692      -12     
  Branches      337      343       +6     
==========================================
+ Hits         2444     2459      +15     
+ Misses        216      193      -23     
+ Partials       44       40       -4     

Impacted Files	Coverage Δ
src/_zkapauthorizer/tests/_exception.py	69.04% <ø> (ø)
src/_zkapauthorizer/model.py	91.89% <100.00%> (+0.15%)
src/_zkapauthorizer/tests/test_model.py	87.20% <100.00%> (+7.78%)
src/_zkapauthorizer/tests/test_plugin.py	100.00% <100.00%> (+3.14%)
...rc/_zkapauthorizer/tests/test_lease_maintenance.py	98.15% <0.00%> (+1.22%)
src/_zkapauthorizer/lease_maintenance.py	93.75% <0.00%> (+7.03%)

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