Template Render to keep unresolved variables as-is in the output about jinjava

[kasingal]

@jasmith-hs | @marius-diumia

Rather than complex solution, as a workaround I created a wrapper on JinjavaInterpreter and just override getAsString() method to not set empty string rather keep the context.currentNode.master.image as-is.

Refer: https://gerrit.onap.org/r/c/ccsdk/cds/+/134501/1/ms/blueprintsprocessor/modules/blueprints/blueprint-core/src/main/kotlin/org/onap/ccsdk/cds/controllerblueprints/core/service/BluePrintJinjaTemplateService.kt#130

This solution can be in original JinjavaInterpreter as a default behavior.

[marius-diumia]

Looks like this feature doesn't exists and I'm Interested as well on using it.
Pushed a PR for this: #1072

[jasmith-hs]

For simple cases, this can already be done with:

context.setDynamicVariableResolver(string -> "{{ " + string + " }}");

[marius-diumia]

Great @jasmith-hs, thank you. It does for now what I need. Checked, but it doesn't work when the token has filters to apply.