Crash with Chinese Characters

[corbinreynolds]

ADAuthenticationContext.acquireTokenWithResource includes an extraQueryParameters parameter. We are seeing an exception / crash when Chinese characters are used in the domain name of the login_hint passed in the extraQueryParameters parameter.

The result is that the startUrl is nil when ADWebAuthController is initialized and an exception is thrown, crashing the app.

Instead of throwing an exception (in non DEBUG environments), this should make it's way back up the stack and be returned as success = false in the ADAuthenticationContext.acquireTokenWithResource call.