fix: add condition which allows code in callback to be reachable (#2376)

Co-authored-by: Juan Heyns <jheyns@mit.edu>

Author: juanheyns

lib/connection.js

@@ -362,6 +362,9 @@ class Connection extends EventEmitter {
     const secureSocket = Tls.connect({
       rejectUnauthorized,
       requestCert: rejectUnauthorized,
+      checkServerIdentity: verifyIdentity
+        ? Tls.checkServerIdentity
+        : function() { return undefined; },
       secureContext,
       isServer: false,
       socket: this.stream,