Solution:
Either install java8 or if you have a working app from JetBrains like a previous manual installation you can copy the jdk from there and paste itin your new copy.
The ToolBox apps are installed in
~/Library/Application Support/JetBrains/Toolbox/apps/PyCharm-P/ch-0/192.6262.63/PyCharm.app
In order to copy the previous jdk from a working pycharm (or other JetBrains app) you can navigate to a manually installed old app in "/Applications" and right click in the app and select "Show Package Content". In the "Contents" folder there would be a "jdk" folder. Copy it to your not working JetBrains app.
REFS:
https://intellij-support.jetbrains.com/hc/en-us/community/posts/360003340039-PyCharm-2019-1-won-t-open-through-Toolbox-App
Still a problem:
PyCharm2019.2 does not open the terminal (OSX 10.10.5)
Cannot open Local Terminal
Failed to start [/bin/bash, --rcfile, /Applications/PyCharm.app/Contents/plugins/terminal/jediterm-bash.in, -i]