Really fixed openFriday bug

It turns out ternary operators are right-associative /BUT/ they don't take precedence over concatenation (who knew!?)</sarcasm>
This meant that when null was passed to the ternary, it was actually concatenated with the string '<td>', making it evaluate to `true` and creating a malformed TD tag that was getting omitted...this would have been obvious if there was some CSS in place....OOPS!
Fixed with parentheses.