Suggestion: Filter without additional params, just next config file

[whawker]

Describe Request:

Currently mapping requires you to pass 3 or 4 values on each line

path-filtering-orb/src/scripts/create-parameters.py

Lines 59 to 64 in 6fb32db

	# currently the supported format for each of the mapping parameter is either:
	# path-regex pipeline-parameter pipeline-parameter-value
	# OR
	# path-regex pipeline-parameter pipeline-parameter-value config-file
	if not (element_count == 3 or element_count == 4):
	raise Exception("Invalid mapping length of {}".format(element_count))

I don't believe a parameter is always necessary, sometimes you just want to forward to a continuation path, without additional parameters.

That is to say, could support for 2 values only be added? (i.e. no params), I believe this would be a common use case in mono repos.

Examples:

    jobs:
      - path-filtering/filter:
          base-revision: main
          mapping: |
            my-app/.* my-app/.circleci/config.yml
            my-other-app/.* my-other-app/.circleci/config.yml

Supporting Documentation Links:

https://circleci.com/developer/orbs/orb/circleci/path-filtering?version=1.0.0

[pc-bob]

would be great, right now I have to add a dummy param to all my continuation configs