title: Mat-expansion-panel without Body
body: <p>Angular 6... I have an accordian grouping multiple mat-expansion-panels.</p>
  
  <p>The panels represent menu options, which when expanded, have a nav-list of sub-menu options.</p>
  
  <p>Some menu options (ie, some mat-expansion-panels), do not have submenus. They can be selected in their own right, by clicking the header, and should open nothing.</p>
  
  <p>I've excluded writing out any panel content (so have no nav-list elements after the header) using *ngIf,  but still,  a body is inserted and clicking on the header, opens up an empty body by about 10 pixels.</p>
  
  <p>How do i make the panel header be clickable, but without any body content displayed ?</p>
  
  <p>Thanks</p>