Initial Filters is not respected when array type filter

When the user supplies an array type filter with initialFilters, the initialFilters are never used. The filter logic has the following code:

	  const urlValue = isArrayFilter ? searchParams?.getAll(key) : searchParams?.get(key);

      // eslint-disable-next-line no-nested-ternary
      loadedFilters[key] = urlValue
        ? (isArrayFilter && !Array.isArray(urlValue) ? [ urlValue ] : urlValue)
        : initialFilters[key];

The issue is that searchParams.getAll returns an empty array when key doesn't exist, so the truthy check on urlValue evaluates to true even though nothing is set.

This can be resolved by checking the length of the array when isArrayFilter is true

Jira Issue: PF-4302

Parti dalla logica dei filtri mostrata nell’issue e traccia come vengono caricati i filtri array e initialFilters quando la chiave URL è assente. Riproduci il caso con un filtro di tipo array e verifica che i valori iniziali configurati vengano mantenuti quando non esistono valori nell’URL.