ld: better fix "Cannot read properties of null"

Author: iparamonau

lib/utils.js

@@ -412,11 +412,7 @@ export function parseJSONSource(text, decode) {
     return JSON.parse(s);
 };
 
-export function parseLDSource(ld, decode, uri) {
-
-    if (!ld) return;
-
-    var ldParsed;
+export function parseLDSource(ld, decode, uri) {    
 
     if (typeof ld === 'string') {
         try {
@@ -427,14 +423,18 @@ export function parseLDSource(ld, decode, uri) {
         }
     }
 
-    if (ld && !(ld instanceof Array)) {
+    if (!ld) return;    
+
+    if (!(ld instanceof Array)) {
         if (!ld['@type'] && ld['@graph'] && Array.isArray(ld['@graph'])) {
             ld = ld['@graph'];
         } else {
             ld = [ld];
         }
     }
 
+    var ldParsed;
+
     const addObject = function(obj) {
 
         const pushObj = function(id, obj) {