Bug 1288529 - New console frontend: Handle console.count calls without label. r=me

--HG--
extra : rebase_source : 8634895d2950705bb2a79b03ea21158d3717fdf5

devtools/client/webconsole/new-console-output/test/components/test_console-api-call.html

@@ -44,8 +44,16 @@ function testConsoleCount() {
 
     const expected = `bar: ${i + 1}`;
     is(messageBody.textContent, expected,
-      "console.count has the expected text content: ${expected}");
+      `console.count has the expected text content: "${expected}"`);
   }
+
+  const packet = yield getPacket("console.count()", "consoleAPICall")
+  const message = prepareMessage(packet);
+  const rendered = renderComponent(ConsoleApiCall, {message: message});
+  const messageBody = getMessageBody(rendered);
+  const expected = "<no label>: 1";
+  is(messageBody.textContent, expected,
+    `console.count without label has the expected text content: "${expected}"`);
 }
 
 function getMessageBody(renderedComponent) {

devtools/client/webconsole/new-console-output/utils/messages.js

@@ -58,7 +58,9 @@ function transformPacket(packet) {
           // Chrome RDP doesn't have a special type for count.
           type = MESSAGE_TYPE.LOG;
           level = MESSAGE_LEVEL.DEBUG;
-          messageText = `${message.counter.label}: ${message.counter.count}`;
+          let {counter} = message;
+          let label = counter.label ? counter.label : l10n.getStr("noCounterLabel");
+          messageText = `${label}: ${counter.count}`;
           parameters = null;
           break;
       }