Actually allow false as a value for sidekiq.backtrace in our Sidekiq

middleware

lib/sidekiq_middlewares.rb

@@ -5,7 +5,8 @@ module SidekiqMiddlewares
     rescue Exception
       backtrace = Rails.backtrace_cleaner.clean($!.backtrace)
       backtrace.reject! { |line| line =~ /lib\/sidekiq_middlewares.rb/ }
-      limit = AppConfig.environment.sidekiq.backtrace.to_i
+      limit = AppConfig.environment.sidekiq.backtrace.get
+      limit = limit ? limit.to_i : 0
       backtrace = [] if limit == 0
       raise $!, $!.message, backtrace[0..limit]
     end