cloud9-component: updating does nothing and do not break

the running instance

component/cloud9/buildout.cfg

@@ -74,6 +74,7 @@ repository = https://github.com/ajaxorg/cloud9.git
 revision = f7d102bc225c922f116d2cea52a746d64343ea59
 location = ${buildout:parts-directory}/cloud9
 git-executable = ${git:location}/bin/git
+develop = true
 use-cache = true
 ignore-ssl-certificate = true
 
@@ -85,8 +86,8 @@ ignore-ssl-certificate = true
 recipe = plone.recipe.command
 stop-on-error = true
 environment = export GIT_SSL_NO_VERIFY=true; export PATH=${git:location}/bin:${nodejs-0.6:location}/bin:${node-sm:location}/node_modules/.bin/:$PATH; export CPPFLAGS="-I${libxml2:location}/include -I${nodejs-0.6:location}/include"; export LDFLAGS="-L${libxml2:location}/lib -Wl,-rpath=${libxml2:location}/lib"; export HOME=${cloud9-git-download:location};
-command = ${:environment} (cd ${cloud9-git-download:location} && ${node-sm:location}/node_modules/.bin/sm install && patch -p1 < ${cloud9-session-directory.patch:location}/${cloud9-session-directory.patch:filename} && ${node-sm:location}/node_modules/.bin/sm install && patch -p1 < ${cloud9-socket.patch:location}/${cloud9-socket.patch:filename} && patch -p1 < ${cloud9-file-already-exist.patch:location}/${cloud9-file-already-exist.patch:filename} && patch -p1 < ${cloud9-remove-all-listeners.patch:location}/${cloud9-remove-all-listeners.patch:filename}) || (rm -fr ${cloud9-git-download:location}; exit 1)
-update-command =
+command = ${:environment} (cd ${cloud9-git-download:location} && ${node-sm:location}/node_modules/.bin/sm install && patch -p1 < ${cloud9-session-directory.patch:location}/${cloud9-session-directory.patch:filename} && patch -p1 < ${cloud9-socket.patch:location}/${cloud9-socket.patch:filename} && patch -p1 < ${cloud9-file-already-exist.patch:location}/${cloud9-file-already-exist.patch:filename} && patch -p1 < ${cloud9-remove-all-listeners.patch:location}/${cloud9-remove-all-listeners.patch:filename}) || (rm -fr ${cloud9-git-download:location}; exit 1)
+update-command = true
 executable = ${cloud9-git-download:location}/server.js
 
 [cloud9-npm]