Hide row when empty on Print page and e-mail

Firstly:

I need to hide the row where a field value is empty in a table on the print page. I can find lots on hiding on list or view pages, but not on print page. Please assist.
Secondly:
I also need to hide this in an event where the value is mailed to the client. When the value is empty, the value should not be e-mailed.
Eg.

I use this code in an html e-mail to send the mail. When this value is empty, I don't want it to send.

Please assist.