Chrome Version: 59.0.3065.0
OS: Chrome OS 9450.0

I normally create .P12 files like this:

$ openssl pkcs12 -export -out ovpn.p12 -inkey client1.key -in client1.crt -certfile ca.crt 
Enter Export Password: <hit enter>
Verifying - Enter Export Password: <hit enter again>

Prior to the MD UI changes, I was able to import these certs by entering a blank password in Chrome.  Post-MD, the OK button is grayed out until I enter at least one character, rendering my certs un-importable.

It would be ideal if the UI logic tried both permutations of "no password" (both "" and NULL) first, and then only prompted for a password if it was strictly needed.