Hide Token Field when the value data is empty

Category changed to bug report since empty value fields should not be processed by the field template. For instance, empty fields formatted with the expert template are shown with the prefix, suffix and wrappers surrounding empty string.

Patch from #1 failed to apply. Strict comparison between value and empty string.

Patch in #4 worked for me.

committed and pushed, thanks!

I'm running into the same problem two years later.

drupal 8.9.10 with DS 8.x-3.x-dev

I created a token filed with a token taken from a node field to provide a link:

<div class="jumbotron margin-up">
  <h5>Buy this album - bundle via bandcamp</h5>
  
  <p><a class="btn btn-primary btn-lg" href="[node:field_bandcamp]" role="button">Learn more</a></p>
</div>

So even the node field is empty the whole DS token field will be rendert

Running into the same with the following:
Category: [node:field_article_category]

If field_article_category is empty I would expect the token field not to be rendered at all. Instead, I get this output: "Category:"

Edit: I think the behavior expected here doesn't make much sense. Let there be more than one Token used within a Token field. The programming logic no longer knows when the field should be hidden and when not. So in my use case I simply took a Twig field which allows checking for empty values and react to all possible constellations.

When using multiple tokens with space between them in this case the label will be rendered if the value is empty so I did a roll-back the patch