fix: ignore IPC channel closed errors

Author: shadowusr

src/browser-pool/cancelled-error.ts

@@ -3,7 +3,7 @@
  */
 export class CancelledError extends Error {
     name = "CancelledError";
-    message =  `Browser request was cancelled
+    message = `Browser request was cancelled
 
 What happened:
 - This test tried to run in a browser that was already stopped

src/utils/ipc.js

@@ -1,9 +1,22 @@
 "use strict";
 
 const _ = require("lodash");
+const debug = require("debug")("testplane:worker:ipc");
 
 module.exports = {
-    emit: (event, data = {}) => process.send({ event, ...data }),
+    emit: (event, data = {}) => {
+        try {
+            process.send({ event, ...data });
+        } catch (error) {
+            // This error happens when master has already shut down, so we can't send anything anyways
+            if (error.code === "ERR_IPC_CHANNEL_CLOSED") {
+                debug("Ignoring IPC channel closed error:");
+                debug(error);
+                return;
+            }
+            throw error;
+        }
+    },
     on: (event, baseHandler) => {
         process.on("message", (...args) => {
             if (event !== _.get(args[0], "event")) {