Implement CONSTRUCT WHERE correctly

[RobinTF]

Queries such as CONSTRUCT WHERE { ?s ?p ?o} are now correctly treated equivalently to CONSTRUCT { ?s ?p ?o} WHERE { ?s ?p ?o}. Previously they returned an empty result because they were evaluated like CONSTRUCT {} WHERE {?s ?p ?o}
Fixes #1349

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 90.02%. Comparing base (098b79c) to head (11dd6f3).
Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1757      +/-   ##
==========================================
+ Coverage   90.01%   90.02%   +0.01%     
==========================================
  Files         395      395              
  Lines       37793    37838      +45     
  Branches     4257     4258       +1     
==========================================
+ Hits        34019    34064      +45     
  Misses       2478     2478              
  Partials     1296     1296              

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[joka921]

Thank you very much,
I have some small questions, but the approach is rather clean and not too intrusive

[joka921]

Only a very minor suggestion remaining, is quick to fix.

[sparql-conformance]

Conformance check passed ✅

Test Status Changes 📊

Number of Tests	Previous Status	Current Status
4	Failed	Passed

Details: https://qlever.cs.uni-freiburg.de/sparql-conformance-ui?cur=11dd6f3247568d5daeeb9ba049f6f68697a80403&prev=098b79c715f9992972a8d3452f5bd10e303c6ce4

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[joka921]

Thank you very much