What would be a good way to handle errors occurring in ctags?

For example I now have a tag which processes search form input. The tag
does some consistency checks on the environment. If errors are detected,
the tag returns
return(map(-err='errormessage'))
Otherwise it returns
return(map(-searchparams=#searchparams))

In my processual code I call the tag like this:

local('i') = MO_searchparams($searchfields);
if(#i -> find(-err));
MO_flash(#i -> find(-err),-class='error');
abort;
/if;
var('searchparams') = #i -> find(-searchparams);

This works ok, but is a little clumsy. Any better ideas? Should be L8
compatible.

- Jussi
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