App Stuck after clicking test connections

[zaherg]

RDM Version: 9 alpha 4
Environment (OS name and version): macOS
Redis Server Version: 4

Steps to reproduce:

1. open connection settings or create new connection

2. fill the information

3. click test connection

Expected result:

To get a message that your connection was established or there is an error in your connection

Actual Result:

App stuck and wont able to close it unless I force quite it. http://d.zah.me/Vcd5Qd/4ZPhvVGz