fix: Missing clauses in MetadataPreloader functions (#10439)

* Missing clause in MetadataPreloader.alter_address

* Update clause for alter_address

* Add nil clause for item_to_address_hash_strings

apps/explorer/lib/explorer/chain/address/metadata_preloader.ex

@@ -127,6 +127,8 @@ defmodule Explorer.Chain.Address.MetadataPreloader do
     end)
   end
 
+  defp item_to_address_hash_strings(nil), do: []
+
   defp item_to_address_hash_strings(%Transaction{
          to_address_hash: to_address_hash,
          created_contract_address_hash: created_contract_address_hash,
@@ -285,14 +287,16 @@ defmodule Explorer.Chain.Address.MetadataPreloader do
     alter_address(address, address.hash, names, field_to_put_info)
   end
 
-  defp alter_address(_, nil, _names, _field) do
+  defp alter_address(address, nil, _names, _field), do: address
-    nil
-  end
 
   defp alter_address(%NotLoaded{}, address_hash, names, field) do
     %{field => names[Address.checksum(address_hash)]}
   end
 
+  defp alter_address(nil, address_hash, names, field) do
+    %{field => names[Address.checksum(address_hash)]}
+  end
+
   defp alter_address(%Address{} = address, address_hash, names, :ens_domain_name) do
     %Address{address | ens_domain_name: names[Address.checksum(address_hash)]}
   end