Force execution to stop with failure on missing image reference

[PeterStange]

I'm looking for a way to cause an failure of the tool execution in case the image reference is invalid and the image couldn't be found.
ascciidoctor offers this by using command line attributes: "asciidoctor -a attribute-missing=warn --failure-level=WARN"
How can I add those parameters when calling a task like generateHTML.
Tried to follow the call sequence and extended attributes defined in AsciiDocBasics.gradle
attributes (
'plantUMLDir' : '',
'attribute-missing' : 'warn'

But this didn't changed the behaviour.
Is there any documentation available about the flow of the execution chain ?
Any existing possibility to enable this kind of warnings?

[rdmueller]

I guess the solution for this is in the following ticket:
asciidoctor/asciidoctor-gradle-plugin#154

[mh182]

Closing since addressed with #1098