test: restore deleted tests with dynamic field visibility support

Adapts icon distribution test for dynamic fields, restores empty cell test

test/mv_web/member_live/index_custom_fields_display_test.exs

@@ -241,4 +241,26 @@ defmodule MvWeb.MemberLive.IndexCustomFieldsDisplayTest do
 
     assert html =~ "alice.private@example.com"
   end
+
+  test "shows empty cell for members without custom field values", %{
+    conn: conn,
+    member2: _member2,
+    field_show_string: field
+  } do
+    conn = conn_with_oidc_user(conn)
+    {:ok, _view, html} = live(conn, "/members")
+
+    # The custom field column should exist
+    assert html =~ field.name
+
+    # Member2 should exist in the table (first_name and last_name are in separate columns)
+    assert html =~ "Bob"
+    assert html =~ "Brown"
+
+    # The value from member1 should appear (phone number)
+    assert html =~ "+49123456789"
+
+    # Note: Member2 doesn't have this custom field value, so the cell is empty
+    # The implementation shows "" for missing values, which is the expected behavior
+  end
 end