In the case where the bugs field contains characters which aren't valid in the

URL, creating the link would fail with NoReverseMatch. In the case discovered,

a URL was entered in the field instead of a bug number.
This change fixes it so that if any URLs don't reverse, we just stick the text

in without a link.

Set up a reproduction case. Before the change, my dashboard gives a

  traceback. After, I see my dashboard correctly.
Ran unit tests.