This code snippet is quite repetitive:

<ul>
  <% if [all[current]has[email]] %>
    <li>''Email'': {{!!email}}</li>
  <% endif %>
  <% if [all[current]has[phone]] %>
    <li>''Phone'': {{!!phone}}</li>
  <% endif %>
  <% if [all[current]has[family]] %>
    <li>''Family'': {{!!family}}</li>
  <% endif %>
  <% if [all[current]has[manager]] %>
    <li>''Manager'': {{!!manager}}</li>
  <% endif %>
</ul>

Write a procedure that wraps the logic that's repeated here, and call it four times to produce the same result.

Hint: To transclude a field of the current tiddler whose name is in a variable, use the $transclude widget with the $field parameter: <$transclude $field=<<myvariable>>/>.