fix(psl): don't trust datasource array to contain at least 1 datasource

psl/psl-core/src/lib.rs

@@ -176,7 +176,7 @@ fn validate_configuration(
     // We need to know the active provider to determine which features are active.
     // This was originally introduced because the `fullTextSearch` preview feature will hit GA stage
     // one connector at a time (Prisma 6 GAs it for MySQL, other connectors may follow in future releases).
-    let active_provider = datasources[0].active_provider;
+    let active_provider = datasources.get(0).map(|ds| ds.active_provider).unwrap_or_default();
     let generators = generator_loader::load_generators_from_ast(schema_ast, diagnostics, active_provider);
 
     Configuration::new(generators, datasources, diagnostics.warnings().to_owned())