The quick answer is that you put a list around it that returns one element
when your conditional is true and nothing when it isn't. So something like
this may work:
<$set name=tiddler-title value={{!!title}}>
<<tiddler-title>>
<$list filter="[tag[Area]]">
<$list filter="[tag<currentTiddler>tag<tiddler-title>
limit[1]]"><$link>''{{!!title}}<br>''</$link></$list>
<$list filter="[tag<currentTiddler>tag<tiddler-title>]">
<$transclude mode="block"/>
</$list>
</$list>
</$set>
That will only show the link to the quarter if there is something listed
under it.
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