Merge pull request #23 from tehdb/master

fix json parse and split not defined issues

Author: danielstjules

lib/hub.js

@@ -79,7 +79,18 @@
     // Ignore the ready message when viewing the hub directly
     if (message.data === 'cross-storage:ready') return;
 
-    request = JSON.parse(message.data);
+    // Check whether message.data is a valid json
+    try {
+      request = JSON.parse(message.data);
+    } catch (err) {
+      return;
+    }
+
+    // Check whether request.method is a string
+    if (!request || typeof request.method !== 'string') {
+      return;
+    }
+
     method = request.method.split('cross-storage:')[1];
 
     if (!method) {