Job config page loads fine, but after clicking on certain post build actions nothing happens and following error occurs: TypeError: $(...) is null @ hudson-behavior.js:377.

This regression was introduced in [1] (merged in [2])

Affected post build actions:
Publish Cobertura Coverage Report

Reproducing selenium-test features:
features/cobertura_plugin.feature:6

[1] https://github.com/jenkinsci/jenkins/commit/ef3d6e46b9826ab84098834261daafaa1fe3b6da
[2] https://github.com/jenkinsci/jenkins/commit/5c6044ca49b67cdc37b0f418efda84d6ff1fa396