Skipping a scope of "openid connect" or "email" results in panic

[mahadevans87]

I was trying to do google OAuth 2.0 login with the following scope -

	goth.UseProviders(
		gothGoogle.New(os.Getenv("OAUTH_KEY"), os.Getenv("OAUTH_SECRET"), "http://localhost:3000/auth/callback", "https://www.googleapis.com/auth/drive.metadata.readonly"),
	)

This results in goth crashing at gothv1,74.1/providers/google/session.go during authorize and token exchange -
On line 44, goth assumes that an id_token is always returned. However, only if we add "email" or "open_id connect" in the scopes, we will get the scope. Otherwise, goth crashes because id_token is never returned.

If you are okay, I can submit a PR for this.

[DeZeeKees]

is there a way to fix this?

[DeZeeKees]

im running into the same problem