If the payload is empty or specifies our branch, build.

If it's not empty and doesn't specify our branch, it's probably a post-receive hook telling us about something we're not interested in.

lib/cijoe/server.rb

@@ -39,7 +39,10 @@ def self.start(host, port, project_path)
       end
 
       post '/' do
-        joe.build if params[:payload].to_s.include? joe.git_branch
+        payload = params[:payload].to_s
+        if payload.empty? || payload.include?(joe.git_branch)
+          joe.build
+        end
         redirect '/'
       end