add targetList to simplify javascript list building

bwreg-service/src/main/java/edu/kit/scc/webreg/service/saml/FederationSingletonBean.java

@@ -92,20 +92,23 @@ public class FederationSingletonBean {
 		}
 		
 		try {
+			List<SamlIdpMetadataEntity> targetList = new ArrayList<SamlIdpMetadataEntity>();
+
 			engine.eval(scriptEntity.getScript());
 
 			Invocable invocable = (Invocable) engine;
 			
-			invocable.invokeFunction("filterIdps", tempList, logger);
+			invocable.invokeFunction("filterIdps", tempList, targetList, logger);
 			
+			return targetList;
 		} catch (ScriptException e) {
 			logger.warn("Script execution failed.", e);
+			return tempList;
 		} catch (NoSuchMethodException e) {
 			logger.info("No filterIdps method in script. returning all Idps");
-		}
-		
 			return tempList;
 		}
+	}
 	
 	public List<SamlIdpMetadataEntity> getAllIdpList() {
 		refreshCache();