MTA fails silently VSCode+OSX+OpenJDK 16.0.1

[deftdawg]

Because of this issue: windup/windup-distribution#73 mat-client doesn't run at all with the VS Code console showing only this:

Using MTA at /Users/dd/Library/Application Support/Code/User/globalStorage/redhat.mta-vscode-extension/.mta/tooling/vscode/mta-cli/mta-cli-5.2.0.Final

The extension should capture stderr and include that into the VS Code output console, so users can see there is an issue rather than letting us just sit there scratching their heads wondering if it ran, is still running or did anything.