handle empty images

apps/block_scout_web/lib/block_scout_web/views/tokens/instance/overview_view.ex

@@ -20,6 +20,7 @@ defmodule BlockScoutWeb.Tokens.Instance.OverviewView do
   def image_src(nil), do: "/images/controller.svg"
 
   def image_src(instance) do
+    result =
       cond do
         instance.metadata && instance.metadata["image_url"] ->
           instance.metadata["image_url"]
@@ -33,6 +34,8 @@ defmodule BlockScoutWeb.Tokens.Instance.OverviewView do
         true ->
           image_src(nil)
       end
+
+    if String.trim(result) == "", do: image_src(nil), else: result
   end
 
   def total_supply_usd(token) do

apps/block_scout_web/test/block_scout_web/views/tokens/instance/overview_view_test.exs

@@ -31,5 +31,11 @@ defmodule BlockScoutWeb.Tokens.Instance.OverviewViewTest do
       assert OverviewView.image_src(%{metadata: data}) ==
                "https://img.paoditu.com/images/cut_trace_images/6b/5f/5b754f6b5f3b5_500_500.jpg"
     end
+
+    test "handles empty images" do
+      instance = %{metadata: %{"image" => ""}}
+
+      assert OverviewView.image_src(instance) != ""
+    end
   end
 end