Extracting taxonomies from page frontmatter

support
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Meanwhile I’ve come up with the following approach:

  1. range through the site-wide taxonomies as above
  2. check for each of them, if .Param.[taxonomyname] exists and is set on the current content page
  3. if yes => go further with extracting the content of the existing .Param.[taxonomyname] => these should be the needed terms.

But in practice I’m not able to do step 2.
I cannot find a way to do something like isset in other languages (at least not one that I understand).