Fixes SPARQL SERVICE parsing

services should be silent if, and only if, they are specified as SILENT

lib/spargebra/src/parser.rs

@@ -1417,7 +1417,7 @@ parser! {
         //[59]
         rule ServiceGraphPattern() -> PartialGraphPattern =
             i("SERVICE") _ i("SILENT") _ name:VarOrIri() _ p:GroupGraphPattern() { PartialGraphPattern::Other(GraphPattern::Service { name, inner: Box::new(p), silent: true }) } /
-            i("SERVICE") _ name:VarOrIri() _ p:GroupGraphPattern() { PartialGraphPattern::Other(GraphPattern::Service{ name, inner: Box::new(p), silent: true }) }
+            i("SERVICE") _ name:VarOrIri() _ p:GroupGraphPattern() { PartialGraphPattern::Other(GraphPattern::Service{ name, inner: Box::new(p), silent: false }) }
 
         //[60]
         rule Bind() -> PartialGraphPattern = i("BIND") _ "(" _ e:Expression() _ i("AS") _ v:Var() _ ")" {