Fix class service query

models/service.classes/html.queries/main.query

@@ -2,7 +2,7 @@
 PREFIX {{h.prefix}}: <{{h.ns}}>
 {%endfor%}
 SELECT DISTINCT ?resource WHERE {
-  {%if base.args.arg0 %}GRAPH <{{base.args.arg0}}>{ {%else%} GRAPH?g { {%endif%}
+  {%if base.args.arg0 %}GRAPH <{{base.args.arg0}}>{ {%else%} GRAPH ?g { {%endif%}
   	[] a ?resource .
   {%if base.args.arg0 %} } {%endif%}
 }