Fix an out-of-bounds read in the OPTIONAL JOIN implementation

[joka921]

No description provided.

[sparql-conformance]

Conformance check passed ✅

No test result changes.

Details: https://qlever.cs.uni-freiburg.de/sparql-conformance-ui?cur=8813fba7e131f159915675ca846b2554d3e902cb&prev=acb6633debc7341985341aff147b5038cc8d951b

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 89.86%. Comparing base (acb6633) to head (8813fba).
Report is 5 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1710   +/-   ##
=======================================
  Coverage   89.86%   89.86%           
=======================================
  Files         389      389           
  Lines       37308    37311    +3     
  Branches     4204     4205    +1     
=======================================
+ Hits        33527    33531    +4     
+ Misses       2485     2481    -4     
- Partials     1296     1299    +3     

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[sonarqubecloud]

Quality Gate failed

Failed conditions
D Maintainability Rating on New Code (required ≥ A)

See analysis details on SonarQube Cloud

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[hannahbast]

Thanks a lor for the fix!