Review request for Ensemble.

[Andrey Rusakov]

Hello, everyone. There were a couple of small bugs that annoyed me while 
analysing manual tests, so I decided to fix them myself.
Bug: https://bugs.openjdk.java.net/browse/JDK-8088078
Webrev: http://cr.openjdk.java.net/~arusakov/8088078/webrev.00/
Please look and confirm.
This diff resolves both 8088078 
<https://bugs.openjdk.java.net/browse/JDK-8088078>and 8088786 
<https://bugs.openjdk.java.net/browse/JDK-8088786> and applicable for 8 
and 9 openjfx.