DEV: Correct error handling in run-qunit

runAllTests is an async function, so the try/catch block does not help. The function always returns a promise, so we need to use `.catch` to handle errors. Previously, raised errors were ignored, and the process continued running until it timed out.

test/run-qunit.js

@@ -127,12 +127,10 @@ async function runAllTests() {
   });
 }
 
-try {
-  runAllTests();
-} catch (e) {
+runAllTests().catch(e => {
   console.log("Failed to run tests: " + e);
   process.exit(1);
-}
+});
 
 // The following functions are converted to strings
 // And then sent to chrome to be evalaluated