Fix panic err using flow templates with workflow

[RamanaReddy0M]

Proposed changes

Closes:

• Workflow match template use flow has Javascript Error #4736
• In custom workflows, nuclei doesn't execute subtemplate if parent template uses flow #5024

Test:

$ ./nuclei -w workflow-test.yaml -u example.com

workflow-test.yaml same as from #4736 issue.

Checklist

• Pull request is created against the dev branch
• All checks passed (lint, unit/integration/regression tests etc.) with my changes
• I have added tests that prove my fix is effective or that my feature works
• I have added necessary documentation (if appropriate)

[tarunKoyalwar]

implementation lgtm !

• the failing unit test seems to be working locally but errors in gh actions
• i have updated the test to only run if pdcp keys are available ( if this persists we can create a followup ticket and fix it )