Merge pull request #1709 from vaidas-lungis/vaidas-lungis-patch-1

Reject if response property is null

src/drivers/npm/driver.js

@@ -61,6 +61,10 @@ const driver = {
       browser.visit(url, error => {
         wappalyzer.driver.document = browser.document;
 
+        if ( !browser.resources['0'].response ) {
+            return reject('No response from server');
+        }
+
         const headers = {};
 
         browser.resources['0'].response.headers._headers.forEach(header => {