Fix zero total supply bug

CHANGELOG.md

@@ -7,6 +7,7 @@
 - [#4353](https://github.com/blockscout/blockscout/pull/4353) - Added live-reload on the token holders page
 
 ### Fixes
+- [#4429](https://github.com/blockscout/blockscout/pull/4429) - Fix 500 response on `/tokens/{addressHash}/token-holders?type=JSON` when total supply is zero
 - [#4419](https://github.com/blockscout/blockscout/pull/4419) - Order contracts in the search by inserted_at in descending order
 - [#4418](https://github.com/blockscout/blockscout/pull/4418) - Fix empty search results for the full-word search criteria
 - [#4406](https://github.com/blockscout/blockscout/pull/4406) - Fix internal server error on the validator's txs page

apps/block_scout_web/lib/block_scout_web/views/tokens/holder_view.ex

@@ -33,6 +33,8 @@ defmodule BlockScoutWeb.Tokens.HolderView do
     "20.0000%"
 
   """
+  def total_supply_percentage(_, 0), do: "N/A%"
+
   def total_supply_percentage(value, total_supply) do
     result =
       value

apps/block_scout_web/test/block_scout_web/views/tokens/holder_view_test.exs

@@ -40,6 +40,13 @@ defmodule BlockScoutWeb.Tokens.HolderViewTest do
 
       assert HolderView.total_supply_percentage(value, total_supply) == "0.0005%"
     end
+
+    test "zero total_supply" do
+      %Token{total_supply: total_supply} = build(:token, total_supply: 0)
+      %TokenBalance{value: value} = build(:token_balance, value: 0)
+
+      assert HolderView.total_supply_percentage(value, total_supply) == "N/A%"
+    end
   end
 
   describe "format_token_balance_value/1" do