Capture requests without explicit format

Author: constantine-nikolaou

app/controllers/application_controller.rb

@@ -1,7 +1,9 @@
 class ApplicationController < ActionController::Base
   protect_from_forgery with: :exception
 
+  # Exceptions
   rescue_from ActionController::InvalidAuthenticityToken, with: :render_422
+  rescue_from ActionView::MissingTemplate, with: :render_204
 
   # API access
   before_action :authenticate_with_token!, if: :api_request
@@ -58,6 +60,10 @@ def handle_unverified_request
     raise(ActionController::InvalidAuthenticityToken)
   end
 
+  def render_204
+    render status: 422, json: { message: "No Content" }
+  end
+
   def render_422
     redirect_to '/422'
   end