From my understanding the "hide-if-empty" tag in article will hide the value if there is no content in it. But in my case it is not working. The frontend will show "not available" instead of a empty line.
after saving the content template, please check the html source in the editor and see if the editor altered your code. TinyMCE/JCE tends to alter the html if there is something what they think that doesn't belong there.
After saved the first time it worked. Then I edited it again and the tag {hide-if-empty} was moved out from the content before <tr> into the top of content .. now it do not work again.
