Determining that a Pandoc Variable is the Empty String

["S. Manning" <scriptor-aFO/2INALiozYggVrLCuDg@public.gmane.org>]

I would like to add a tag system to my static site which I generate with 
Pandoc templates.  Adding a tags: variable in myPage.yaml is easy, but 
then I want to add links from pages with the tag to the page for that 
tag.  Code like:

$for(tags)$
<a href="https://mysite.org/tags/$tags$.html">⇐ back to $tags$</a>&nbsp;
$endfor$

adds a link even if the tags variable is empty ("tags: " in the YAML 
file).

How can I check that the tag is not empty or a null string or however 
Pandoc defines it?

https://pandoc.org/MANUAL.html#interpolated-variables alludes to 
variable types such as string and list, but does not define them or 
explain how to get the attributes of complex variables such as lists.

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