Support empty card title in the dashboard (#22199)

frontend/src/metabase/visualizations/components/ChartCaption.jsx

@@ -18,7 +18,7 @@ const ChartCaption = ({
   actionButtons,
   onChangeCardAndRun,
 }) => {
-  const title = settings["card.title"] || series[0].card.name;
+  const title = settings["card.title"] ?? series[0].card.name;
   const description = settings["card.description"];
   const data = series._raw || series;
   const card = data[0].card;

frontend/test/metabase/scenarios/dashboard/dashboard.cy.spec.js

@@ -3,6 +3,7 @@ import {
   restore,
   selectDashboardFilter,
   expectedRouteCalls,
+  editDashboard,
   showDashboardCardActions,
   filterWidget,
   sidebar,
@@ -81,6 +82,24 @@ describe("scenarios > dashboard", () => {
     cy.findByText("How many orders were placed in each year?");
   });
 
+  it("should allow empty card title (metabase#12013)", () => {
+    visitDashboard(1);
+
+    cy.findByTextEnsureVisible("Orders");
+    cy.findByTestId("legend-caption").should("exist");
+
+    editDashboard();
+    showDashboardCardActions();
+    cy.icon("palette").click();
+
+    cy.findByDisplayValue("Orders")
+      .click()
+      .clear();
+    cy.get("[data-metabase-event='Chart Settings;Done']").click();
+
+    cy.findByTestId("legend-caption").should("not.exist");
+  });
+
   it("should add a filter", () => {
     visitDashboard(1);
     cy.icon("pencil").click();