guard against document.location being null or undefined

fixes #356

Author: mattrobenolt

src/raven.js

@@ -680,12 +680,15 @@ function now() {
 
 function getHttpData() {
     var http = {
-        url: document.location.href,
         headers: {
             'User-Agent': navigator.userAgent
         }
     };
 
+    if (document.location && document.location.href) {
+        http.url = document.location.href;
+    }
+
     if (document.referrer) {
         http.headers.Referer = document.referrer;
     }

test/raven.test.js

@@ -170,7 +170,7 @@ describe('globals', function() {
         var data = getHttpData();
 
         it('should have a url', function() {
-                assert.equal(data.url, window.location.href);
+            assert.equal(data.url, window.location.href);
         });
 
         it('should have the user-agent header', function() {
@@ -185,7 +185,6 @@ describe('globals', function() {
                 assert.isUndefined(data.headers.Referer);
             }
         });
-
     });
 
     describe('isUndefined', function() {