How to disable certificate validation or allow a Empty issuer DN Self-signed cert in SoapUI 5.8.0?

Hi, 

I encountered an error from SoapUI to send a POST/GET request to our dev server service api via https like this

https://xxx.sandbox.cloud.xyz/auth/v3/oauth/token?grant_type=client_credentials&client_id=myid&client_secret=mysecret

This is because the server side has a Empty issuer DN Self-signed cert installed on its HTTPS.

Here are the errors SoapUI returned.

INFO:Error getting response for [https://xxx.sandbox.cloud.xyz.Token:Request 1]; javax.net.ssl.SSLHandshakeException: Failed to parse server certificates

ERROR:java.security.cert.CertificateParsingException: Empty issuer DN not allowed in X509Certificates

I changed to use another tool called Postman to call above same api, because Postman has a option 'Request : disable SSL certificate validation' in its setting, I was able to send the request and get the service response once I disabled the SSL certificate validation.

My question is -

1. Does SoapUI have the similar  'disable SSL certificate validation'  option or not like in PostMan?
2. How can I use SoapUI to send a request to a https api service and get its response successfully which has an Empty issuer DN Self-signed certificate installed?

Thank you!