Fix fetch_coin_balance query to compare between balances with values (#9638)

* Fix fetch_coin_balance query to compare between balances with non-nil values

* Review fix

CHANGELOG.md

@@ -20,6 +20,7 @@
 ### Fixes
 
 - [#9640](https://github.com/blockscout/blockscout/pull/9640) - Fix no function clause matching in `BENS.item_to_address_hash_strings/1`
+- [#9638](https://github.com/blockscout/blockscout/pull/9638) - Fix fetch_coin_balance query to compare between balances with values
 - [#9629](https://github.com/blockscout/blockscout/pull/9629) - Don't insert pbo for not inserted blocks
 - [#9601](https://github.com/blockscout/blockscout/pull/9601) - Fix token instance transform for some unconventional tokens
 - [#9597](https://github.com/blockscout/blockscout/pull/9597) - Update token transfers block_consensus by block_number

apps/block_scout_web/lib/block_scout_web/channels/address_channel.ex

@@ -193,11 +193,13 @@ defmodule BlockScoutWeb.AddressChannel do
       ) do
     coin_balance = Chain.get_coin_balance(socket.assigns.address_hash, block_number)
 
-    rendered_coin_balance = AddressViewAPI.render("coin_balance.json", %{coin_balance: coin_balance})
+    if coin_balance.value && coin_balance.delta do
+      rendered_coin_balance = AddressViewAPI.render("coin_balance.json", %{coin_balance: coin_balance})
 
-    push(socket, "coin_balance", %{coin_balance: rendered_coin_balance})
+      push(socket, "coin_balance", %{coin_balance: rendered_coin_balance})
 
-    push_current_coin_balance(socket, block_number, coin_balance)
+      push_current_coin_balance(socket, block_number, coin_balance)
+    end
 
     {:noreply, socket}
   end
@@ -207,19 +209,21 @@ defmodule BlockScoutWeb.AddressChannel do
 
     Gettext.put_locale(BlockScoutWeb.Gettext, socket.assigns.locale)
 
-    rendered_coin_balance =
-      View.render_to_string(
-        AddressCoinBalanceView,
-        "_coin_balances.html",
-        conn: socket,
-        coin_balance: coin_balance
-      )
+    if coin_balance.value && coin_balance.delta do
+      rendered_coin_balance =
+        View.render_to_string(
+          AddressCoinBalanceView,
+          "_coin_balances.html",
+          conn: socket,
+          coin_balance: coin_balance
+        )
 
-    push(socket, "coin_balance", %{
-      coin_balance_html: rendered_coin_balance
-    })
+      push(socket, "coin_balance", %{
+        coin_balance_html: rendered_coin_balance
+      })
 
-    push_current_coin_balance(socket, block_number, coin_balance)
+      push_current_coin_balance(socket, block_number, coin_balance)
+    end
 
     {:noreply, socket}
   end