The issue summary table had a mouse cursor and click event enabled for

every row, and this included the row with the "There are no issues" text

we show when the active filter turns up 0 results. Clicking this would

take the user to a 404 page with "undefined" at the end of the URL.
This change makes the click handler more specific, only listening to

events on rows with an issue ID set.
The mouse cursor for tabular fields is now the default for text, rather

than the "it's clickable" pointer. This is a more correct default. The

issue summary table specializes that, setting the cursor only for rows

with an issue ID.

Unit tests pass.
Tested the mouse cursor on issue rows and non-issue rows. Verified that

the cursor only indicated a row was clickable for issue rows.
Tested clicking issue rows and non-issue rows. Verified that the click

was only handled for issue rows.