Don't try upload a changelog if it doesn't exist

.gitignore

@@ -3,4 +3,5 @@ errors
 error_log.txt
 .sass-cache/
 .env
-.DS_Store
+.DS_Store
+activity_pods

cocoapods-simple.rb

@@ -106,8 +106,11 @@ def run
   generator = WebsiteGenerator.new(generate_json: false, spec: spec)
 
   server_folder = "docsets"
-  generator.upload_folder "/readme/#{spec.name}/#{spec.version}/README.html", "/#{server_folder}/#{spec.name}/", "put"
-  generator.upload_folder "/changelog/#{spec.name}/#{spec.version}/CHANGELOG.html", "/#{server_folder}/#{spec.name}/", "put"
+  rendered_readme_path = "/readme/#{spec.name}/#{spec.version}/README.html"
+  rendered_changelog_path = "/changelog/#{spec.name}/#{spec.version}/CHANGELOG.html"
+
+  generator.upload_folder rendered_readme_path, "/#{server_folder}/#{spec.name}/", "put" if File.exist? rendered_readme_path
+  generator.upload_folder rendered_changelog_path, "/#{server_folder}/#{spec.name}/", "put" if File.exist? rendered_changelog_path
 
   # Give a clickable link
   puts '* [pods] - ' + website_home + 'docsets/' + spec.name + '/' + spec.version.to_s + '/'