Merge pull request #5809 from blockscout/np-fix-404-metadata

Add check for nil metadata to avoid empty tab

CHANGELOG.md

@@ -3,6 +3,7 @@
 ### Features
 
 ### Fixes
+- [#5809](https://github.com/blockscout/blockscout/pull/5809) - Fix 404 on `/metadata` page
 - [#5786](https://github.com/blockscout/blockscout/pull/5786) - Replace `current_path` with `Controller.current_full_path` in two controllers
 - [#5807](https://github.com/blockscout/blockscout/pull/5807) - Update Makefile migrate command due to release build
 

apps/block_scout_web/lib/block_scout_web/templates/tokens/instance/overview/_tabs.html.eex

@@ -5,7 +5,7 @@
         to: token_instance_path(@conn, :show, @token.contract_address_hash, to_string(@token_instance.token_id))
       )
     %>
-  <%= if @token_instance.instance do %>
+  <%= if @token_instance.instance && @token_instance.instance.metadata do %>
     <%= link(
         gettext("Metadata"),
         to: token_instance_metadata_path(@conn, :index, Address.checksum(@token.contract_address_hash), to_string(@token_instance.token_id)),