HTTP error codes break loading bar

[kaarelkivistik]

When request returns an error code, angular-loading-bar becomes broken and won't disappear anymore.

GET http://mysite/is-logged-in 401 (Unauthorized)
TypeError: Cannot read property 'config' of undefined
    at response (http://localhost:9001/bower_components/angular-loading-bar/build/loading-bar.js:116:24)

(Source)

'response': function(response) {
          if (!response.config.ignoreLoadingBar && !isCached(response.config)) {
            reqsCompleted++;
            $rootScope.$broadcast('cfpLoadingBar:loaded', {url: response.config.url});
            if (reqsCompleted >= reqsTotal) {
              setComplete();
            } else {
              cfpLoadingBar.set(reqsCompleted / reqsTotal);
            }
          }
          return response;
        }

Seems that no config object is returned when request "failed" (401 was actually expected here).

[chieffancypants]

This is likely an issue with another interceptor. Angular requires a config option be passed to all interceptors.

More info: #50 (comment)

Closing for now as I've seen this issue a dozen times and each time it's been related to a bad interceptor. Please re-open if that's not the case, however.