title: Firebase crash reporting for iOS doesn't send crashes despite successful init
body: <p>I added firebase crash reporting to my iOS project (added pod, added build phase script, added json to project, ...).
  When i run my app, i see in my console: </p>
  
  <pre><code>Firebase Crash Reporting: Successfully enabled
  </code></pre>
  
  <p>For testing, i insert fatalError() in my code after my FIRApp.configure() code (as suggested here: <a href="https://firebase.google.com/docs/crash/ios#create_your_first_error">https://firebase.google.com/docs/crash/ios#create_your_first_error</a>).</p>
  
  <p>No crash reports are sent at my next app launch (that doesn't crash). I see nothing in my xcode console and nothing in my web console.</p>