In the /configure web UI for a job, select 'Add PostBuild Action' -> 'Editable Email Notifications' -> 'Advanced Settings' -> 'Add Trigger' -> 'Still Failing' (or any other)

No trigger UI fields are added and the Jenkins server log reports:

Sep 13, 2013 3:24:42 PM hudson.widgets.RenderOnDemandClosure$1 generateResponse
WARNING: Failed to evaluate the template closure
org.apache.commons.jelly.JellyTagException: jar:file:/Users/Shared/Jenkins/Home/war/WEB-INF/lib/jenkins-core-1.529.jar!/lib/form/hetero-list.jelly:135:100: <st:include> org.apache.commons.jelly.JellyTagException: jar:file:/Users/Shared/Jenkins/Home/war/WEB-INF/lib/jenkins-core-1.529.jar!/lib/form/entry.jelly:73:23: <d:invokeBody> org.apache.commons.jelly.JellyTagException: jar:file:/Users/Shared/Jenkins/Home/war/WEB-INF/lib/jenkins-core-1.529.jar!/lib/form/advanced.jelly:52:23: <d:invokeBody> org.apache.commons.jelly.JellyTagException: jar:file:/Users/Shared/Jenkins/Home/war/WEB-INF/lib/jenkins-core-1.529.jar!/lib/form/entry.jelly:73:23: <d:invokeBody> Cannot get property 'contentType' on null object
at org.apache.commons.jelly.impl.TagScript.handleException(TagScript.java:726)
at org.apache.commons.jelly.impl.TagScript.run(TagScript.java:281)
at org.kohsuke.stapler.jelly.CallTagLibScript$1.run(CallTagLibScript.java:98)
at org.apache.commons.jelly.tags.define.InvokeBodyTag.doTag(InvokeBodyTag.java:91)
at org.apache.commons.jelly.impl.TagScript.run(TagScript.java:269)
at org.apache.commons.jelly.impl.ScriptBlock.run(ScriptBlock.java:95)
at org.apache.commons.jelly.TagSupport.invokeBody(TagSupport.java:161)
at org.apache.commons.jelly.tags.core.OtherwiseTag.doTag(OtherwiseTag.java:41)
at org.apache.commons.jelly.impl.TagScript.run(TagScript.java:269)
at org.apache.commons.jelly.impl.ScriptBlock.run(ScriptBlock.java:95)
at org.apache.commons.jelly.TagSupport.invokeBody(TagSupport.java:161)
at org.apache.commons.jelly.tags.core.ChooseTag.doTag(ChooseTag.java:38)
at org.apache.commons.jelly.impl.TagScript.run(TagScript.java:269)
at org.apache.commons.jelly.tags.core.CoreTagLibrary$2.run(CoreTagLibrary.java:105)
at org.kohsuke.stapler.jelly.CallTagLibScript.run(CallTagLibScript.java:119)
at org.kohsuke.stapler.jelly.CallTagLibScript$1.run(CallTagLibScript.java:98)
at org.kohsuke.stapler.jelly.DefaultScriptInvoker.invokeScript(DefaultScriptInvoker.java:63)
at org.kohsuke.stapler.jelly.DefaultScriptInvoker.invokeScript(DefaultScriptInvoker.java:53)
at hudson.widgets.RenderOnDemandClosure$1.generateResponse(RenderOnDemandClosure.java:100)
at org.kohsuke.stapler.HttpResponseRenderer$Default.handleHttpResponse(HttpResponseRenderer.java:110)