Set default commands correctly.

providers/rails.rb

@@ -20,7 +20,7 @@
 
 action :before_compile do
 
-  new_resource.migration_command ||= "rake db:migrate"
+  new_resource.migration_command "rake db:migrate" if !new_resource.migration_command
 
   new_resource.environment.update({
     "RAILS_ENV" => new_resource.environment_name,

providers/unicorn.rb

@@ -19,7 +19,7 @@
 #
 
 action :before_compile do
-  new_resource.restart_command ||= "/etc/init.d/#{new_resource.id} hup"
+  new_resource.restart_command "/etc/init.d/#{new_resource.id} hup" if !new_resource.restart_command
 end
 
 action :before_deploy do