--list-scenarios should work correctly when multiple templates are chained together

[msmygit]

Describe the bug
When the scenario it is set as below in the workload file,

...
scenarios:
  default:
    rampup: >-
      run tags==block:rampup errors=counter,warn
      cycles===TEMPLATE(rampup_cycles,TEMPLATE(trainsize))
...

we are receiving an error as below when nb5 --list-scenarios is invoked,

/Users/madhavan.sridharan/Data/Tools/jdk/jdk-21.jdk/Contents/Home/bin/java -Dfile.encoding=UTF-8 -Dsun.stdout.encoding=UTF-8 -Dsun.stderr.encoding=UTF-8 -jar /Users/madhavan.sridharan/Data/Tools/nosqlbench/nb5/target/nb5-5.21.1-SNAPSHOT-jar-with-dependencies.jar --list-scenarios --show-stacktraces
    2064 ERROR [main] ERRORHANDLER Error from driver or included library: Error while getting workloads:Error while scanning path '/activities/milvus.yaml':Index 1 out of bounds for length 1
java.lang.RuntimeException: Error while getting workloads:Error while scanning path '/activities/milvus.yaml':Index 1 out of bounds for length 1
	at io.nosqlbench.engine.cli.NBCLIScenarios.printWorkloads(NBCLIScenarios.java:34)
	at io.nosqlbench.engine.cli.NBCLI.applyDirect(NBCLI.java:266)
	at io.nosqlbench.engine.cli.NBCLI.apply(NBCLI.java:123)
	at io.nosqlbench.engine.cli.NBCLI.main(NBCLI.java:103)
Caused by: java.lang.RuntimeException: Error while scanning path '/activities/milvus.yaml':Index 1 out of bounds for length 1
	at io.nosqlbench.engine.api.scenarios.NBCLIScenarioPreprocessor.filterForScenarios(NBCLIScenarioPreprocessor.java:349)
	at io.nosqlbench.engine.api.scenarios.NBCLIScenarioPreprocessor.getWorkloadsWithScenarioScripts(NBCLIScenarioPreprocessor.java:375)
	at io.nosqlbench.engine.cli.NBCLIScenarios.printWorkloads(NBCLIScenarios.java:32)
	... 3 more
Caused by: java.lang.ArrayIndexOutOfBoundsException: Index 1 out of bounds for length 1
	at io.nosqlbench.engine.api.scenarios.NBCLIScenarioPreprocessor.matchTemplates(NBCLIScenarioPreprocessor.java:425)
	at io.nosqlbench.engine.api.scenarios.NBCLIScenarioPreprocessor.filterForScenarios(NBCLIScenarioPreprocessor.java:326)
	... 5 more
    2071 ERROR [main] ERRORHANDLER cause (see stack trace for details):Error while scanning path '/activities/milvus.yaml':Index 1 out of bounds for length 1
Scenario stopped due to error. See logs for details.

Process finished with exit code 2

To Reproduce
See above.

What was Expected
--list-scenarios should work without any hiccups thereby listing the included driver's workload file to provide the output.

Additional context
Add any other context about the problem here.
OS: Everywhere
environment: Everywhere
version info (./nb --version or java -jar nb.jar --version): 5.21.1-preview

Screenshots, if applicable
n/a