Code review comment for lp:~deryck/launchpad/show-package-hot-bugs-455995

This branch fixes bug 455995, which notes that a hot bugs list for a
distro bugs home page doesn't show the package name. The fix for this
is to test that we should be showing the column using
view.columns_to_show and add the column if so.

= Launchpad lint =

Checking for conflicts. and issues in doctests and templates.
Running jslint, xmllint, pyflakes, and pylint.
Using normal rules.

Linting changed files:
  lib/lp/bugs/templates/bugtarget-bugs.pt