Revert "benchmark: fix CLI arguments check in common.js"

This reverts commit e34f8e1.

PR-URL: #12474
Reviewed-By: Myles Borins <myles.borins@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>

benchmark/common.js

@@ -42,8 +42,8 @@ Benchmark.prototype._parseArgs = function(argv, configs) {
   const extraOptions = {};
   // Parse configuration arguments
   for (const arg of argv) {
-    const match = arg.match(/^(.+?)=([\s\S]+)$/);
-    if (!match) {
+    const match = arg.match(/^(.+?)=([\s\S]*)$/);
+    if (!match || !match[1]) {
       console.error('bad argument: ' + arg);
       process.exit(1);
     }