Added a BigBlueButton error page (#548)

spec/controllers/application_controller_spec.rb

@@ -24,11 +24,13 @@ end
 
 describe ApplicationController do
   controller do
-    before_action :check_if_unbanned
-
     def index
       head :ok
     end
+
+    def error
+      raise BigBlueButton::BigBlueButtonException
+    end
   end
 
   context "roles" do
@@ -56,4 +58,13 @@ describe ApplicationController do
       expect(response).to redirect_to(root_path)
     end
   end
+
+  context "errors" do
+    it "renders a BigBlueButton error if a BigBlueButtonException occurrs" do
+      routes.draw { get "error" => "anonymous#error" }
+
+      get :error
+      expect(response).to render_template("errors/bigbluebutton_error")
+    end
+  end
 end