Enabling option "Send separate e-mails to individuals who broke the build" for
particular job leads to NPE at the end of the build:

ava.lang.NullPointerException
at javax.mail.internet.InternetAddress.parse(InternetAddress.java:595)
at javax.mail.internet.InternetAddress.parse(InternetAddress.java:555)
at javax.mail.internet.InternetAddress.<init>(InternetAddress.java:91)
at hudson.tasks.Mailer.createEmptyMail(Mailer.java:296)
at hudson.tasks.Mailer.createDefaultMail(Mailer.java:147)
at hudson.tasks.Mailer.getMail(Mailer.java:140)
at hudson.tasks.Mailer.perform(Mailer.java:82)
at hudson.model.Build$1.post(Build.java:347)
at hudson.model.Run.run(Run.java:523)
at hudson.model.Build.run(Build.java:289)
at hudson.model.Executor.run(Executor.java:60)

And indeed, Hudson tries to find out user's email, but for most users, they
probably didn't configure their email in User View (is that the place to set up
the email for users?), so user.getProperty().getAddress() returns null and
attempt to send an e-mail to that address leads to NPE