Fix bug preventing session from returning objects equivalent to «false» in a JS test

src/js/session.js

@@ -31,7 +31,7 @@ function Session(async) {
 	}
 
 	function get(path, obj) {
-		obj = obj || session;
+		obj = obj == undefined ? session : obj;
 		if(Array.isArray(path)) {
 			if(path.length == 0) {
 				return obj;