React-Router 1.0.0+ async onEnter in IE7 fix

gistfile1.txt

/*
  Issue: If a component with an asyn onEnter (for example implementing a willTransitionTo type behavior) is rendered in IE7
  React will throw an error about not being able to locate a dom node, (in this case it is the root route).
  
  Reason: React-Router passes null to React while it is waiting for the async onEnter callback to be called. When React gets
  a null value it instead renders an element with a tag of <noscript>. the <noscript> tag was not showing up in the element
  that React was rendering into, not sure why this is though
  
  Fix: instead of returning <noscript> return an empty <span>. We are using webpack so this was done by parsing the source 
  and specificly replacing the ReactInjection.EmptyComponent.injectEmptyComponent('noscript'); call 
  from ReactDefaultInjection.js
*/

    if (/\/ReactDefaultInjection\.js?/.test(this.resourcePath)) {
        source = source.replace(/ReactInjection\.EmptyComponent\.injectEmptyComponent\('noscript'\);/, 'ReactInjection.EmptyComponent.injectEmptyComponent(\'span\');');
    }