refactor: cleanup mix credo issues

lib/components_elixir/inventory/component.ex

@@ -70,17 +70,21 @@ defmodule ComponentsElixir.Inventory.Component do
 
   defp validate_url(changeset, field) do
     validate_change(changeset, field, fn ^field, url ->
-      if url && url != "" do
-        case URI.parse(url) do
-          %URI{scheme: scheme} when scheme in ["http", "https"] -> []
-          _ -> [{field, "must be a valid URL"}]
-        end
-      else
-        []
+      cond do
+        is_nil(url) or url == "" -> []
+        valid_url?(url) -> []
+        true -> [{field, "must be a valid URL"}]
       end
     end)
   end
 
+  defp valid_url?(url) do
+    case URI.parse(url) do
+      %URI{scheme: scheme} when scheme in ["http", "https"] -> true
+      _ -> false
+    end
+  end
+
   @doc """
   Returns true if the component has an image.
   """