fix: remove un-needed check (#2144)

lua/telescope/config.lua

@@ -858,10 +858,8 @@ function config.set_defaults(user_defaults, tele_defaults)
     assert(description, "Config values must always have a description")
 
     config.values[name] = get(name, default_val)
-    if description then
     config.descriptions[name] = strings.dedent(description)
   end
-  end
 
   for key, info in pairs(tele_defaults) do
     set(key, info[1], info[2])