trap and warn about missing hoptoad

lib/taps/server.rb

@@ -1,14 +1,9 @@
-require 'hoptoad_notifier'
 require 'sinatra/base'
 require 'taps/config'
 require 'taps/utils'
 require 'taps/db_session'
 require 'taps/data_stream'
 
-HoptoadNotifier.configure do |config|
-  config.api_key = ENV["HOPTOAD_API_KEY"]
-end
-
 module Taps
 class Server < Sinatra::Base
   use Rack::Auth::Basic do |login, password|
@@ -18,8 +13,17 @@ class Server < Sinatra::Base
   use Rack::Deflater unless ENV['NO_DEFLATE']
 
   error do
-    HoptoadNotifier.notify(e)
     e = request.env['sinatra.error']
+    begin
+      require 'hoptoad_notifier'
+      HoptoadNotifier.configure do |config|
+        config.api_key = ENV["HOPTOAD_API_KEY"]
+      end
+      HoptoadNotifier.notify(e)
+    rescue LoadError
+      puts "An error occurred but Hoptoad was not notified. To use Hoptoad, please"
+      puts "install the 'hoptoad_notifier' gem and set ENV[\"HOPTOAD_API_KEY\"]"
+    end
     if e.kind_of?(Taps::BaseError)
       content_type "application/json"
       halt 412, { 'error_class' => e.class.to_s, 'error_message' => e.message, 'error_backtrace' => e.backtrace.join("\n") }.to_json