If we can't just push it after a fast-forward merge, something is wrong. Don't assume it's all fine.

templates/merger.xml

@@ -58,10 +58,10 @@ cd {{ NAME }}
 git checkout {{ DEFAULT_BRANCH }}
 git checkout -b {{ PACKAGING_BRANCH_S }} || git checkout {{ PACKAGING_BRANCH_S }}
 git merge --ff-only {{ DEFAULT_BRANCH }}
-git push --set-upstream origin {{ PACKAGING_BRANCH_S }} || echo "cannot push"
+git push --set-upstream origin {{ PACKAGING_BRANCH_S }}
 git checkout -b {{ PACKAGING_BRANCH_U }} || git checkout {{ PACKAGING_BRANCH_U }}
 git merge --ff-only {{ PACKAGING_BRANCH_S }}
-git push --set-upstream origin {{ PACKAGING_BRANCH_U }} || echo "cannot push"
+git push --set-upstream origin {{ PACKAGING_BRANCH_U }}
       </command>
     </hudson.tasks.Shell>
   </builders>