fix: Check for host-sets in a target for empty message displa

ui/core/app/templates/scopes/scope/projects/project/targets/target/host-sets.hbs

@@ -1,6 +1,6 @@
 {{title (t "resources.host-sets")}}
 
-{{#if @model}}
+{{#if @model.hostSets}}
 
   <Rose::Table as |table|>
     <table.header as |header|>