removed FILTER EXISTS clause

[Daniel-Mietchen]

Fixes #2208

Description

Removed the FILTER EXISTS clause from
organization_page-production.sparql

Caveats

• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update
  • I have made corresponding changes to the documentation
• This change requires new dependencies (please list)

If you make changes to the Python code

• My code passes the tox check, I can receive warnings about tests, documentation or both

Testing

Screenshots

• https://scholia.toolforge.org/organization/Q3530296#page-production (i.e. before)
  
• local (i.e. after)
  

Checklist

• I have commented my code, particularly in hard-to-understand areas
• My changes generate no new warnings
• I have not used code from external sources without attribution
• I have considered accessibility in my implementation
• There are no remaining debug statements (print, console.log, ...)

[egonw]

Okay, I have a hard time comparing the before/after, but the after looks fine and the before times out (for https://scholia.toolforge.org/organization/Q19845644#page-production).

But since it's via researchers that we know which works go with the institute and my limited understand of SPARQL, this also makes sense.

[fnielsen]

I think there will be a double count if there are subunits, e.g., https://www.wikidata.org/wiki/Q20895241 for https://www.wikidata.org/wiki/Q1137652 vs. https://www.wikidata.org/wiki/Q19845644

[fnielsen]

There shouldn't be this discrepancy:

https://w.wiki/6PCA : 2022 | 5.30526315789473684211 | Egon Willighagen

https://w.wiki/6PCC : 2022 | 10.61052631578947368421 | Egon Willighagen

Perhaps a version with WITH is better.