SPARQL Constraint Violations Cause Display Error and Incorrect Failure Count

[EttoreM]

Description

When a SHACL shape with a SPARQL constraint (sh:sparql) detects a violation, the failed check is not counted in the validation summary statistics.

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Also, after typing y to see the details, the validator crashes with a TypeError if no sh:description is provided to the NodeShape.

Steps to Reproduce

• Create a SHACL shape with a sh:sparql constraint that detects a violation

# Example SHACL Shape:
five-safes-crate:AgentProjectIntersection
    a sh:NodeShape ;
    sh:name "Agent Project Membership Validation" ;
    sh:target [ ... ] ;
    sh:sparql [
        a sh:SPARQLConstraint ;
        sh:message "Validation message" ;
        sh:select "SELECT $this WHERE { ... }" ;
        sh:severity sh:Violation ;
    ] .

• Run the validator on an RO-Crate that violates this constraint
• Observe the error when attempting to view validation details (see images below)

Expected Behavior

• The validation should report the failure
• The failed check should be counted in the summary statistics
• The violation details should be displayed without errors

Actual Behavior

• The validation correctly detects the failure (final status shows "FAILED")
• The summary shows "0 FAILED Checks" instead of counting the SPARQL constraint violation
• When attempting to display details, a TypeError occurs.