fixing validation

templates/enable_workspace_clients_for_context.json.j2

@@ -18,7 +18,7 @@
 				"id" : "${workflow.input.client_id}",
 				"ctx" : "${workflow.input.context}",
 				"filter" : "${workflow.input.filter}",
-				"scriptExpression": "function e(v){ return (v == null || (v.trim && v.trim() === ''))}; if(e($.ctx)) throw('Context must not be empty'); f=$.filter; if(e(f)) f = []; else if(!(f instanceof Array)) throw('Filter must be empty or Array'); return { encoded_root_vo : encodeURI($.root_vo), filter : f}"
+				"scriptExpression": "function e(v){ return (v == null || (v.trim && v.trim() === ''))}; if(e($.ctx)) throw('Context must not be empty'); f=$.filter; if(e(f)) f = []; else if(f instanceof String)) f=[f]; return { encoded_root_vo : encodeURI($.root_vo), filter : Java.to(f,'java.lang.String[]')}"
 			}
 		}
 	]