console plugin fix (#832)

* fix: empty payload in console-plugin

* update unit test

packages/rrweb/test/__snapshots__/integration.test.ts.snap

@@ -7806,6 +7806,21 @@ exports[`record integration tests should record console messages 1`] = `
       }
     }
   },
+  {
+    \\"type\\": 6,
+    \\"data\\": {
+      \\"plugin\\": \\"rrweb/console@1\\",
+      \\"payload\\": {
+        \\"level\\": \\"log\\",
+        \\"trace\\": [
+          \\"__puppeteer_evaluation_script__:19:37\\"
+        ],
+        \\"payload\\": [
+          \\"\\\\\\"TypeError: a message\\\\\\"\\"
+        ]
+      }
+    }
+  },
   {
     \\"type\\": 3,
     \\"data\\": {

packages/rrweb/test/integration.test.ts

@@ -471,6 +471,7 @@ describe('record integration tests', function (this: ISuite) {
       console.trace('trace');
       console.warn('warn');
       console.clear();
+      console.log(new TypeError('a message'));
       const iframe = document.createElement('iframe');
       document.body.appendChild(iframe);
     });