Not sure how this could be solved easily (but I also didn't look into it); anyhow it would be nice if only those filter params were sent which are actually set, because this would make the URL much more readable, e.g. only https://hapa.acdh-dev.oeaw.ac.at/archiv/hapaplacename/?name=Ha
pushed a quick fix. The default empty lookup filter is disabled now. It will take the first element of the lookup list which is icontains.
Regarding the URL I have to find out how this works.
If there is no lookup-filter set, but the search field populated, the filter does not work; see e.g. https://hapa.acdh-dev.oeaw.ac.at/archiv/hapaplacename/?name=Ha&name_lookup=&alternative_names=&alternative_names_lookup=&wortbildung=&wortbildung_lookup=&etymology=&etymology_lookup=&syntax=&syntax_lookup=&comment=&comment_lookup=&internal_comment=&internal_comment_lookup=&unclear=unknown&Filter=Search
Not sure how this could be solved easily (but I also didn't look into it); anyhow it would be nice if only those filter params were sent which are actually set, because this would make the URL much more readable, e.g. only https://hapa.acdh-dev.oeaw.ac.at/archiv/hapaplacename/?name=Ha