Response key deleted by MarkdownStoryReader

[samsucik]

Rasa version: 2.0.0

Rasa SDK version (if used & relevant):

Rasa X version (if used & relevant):

Python version: 3.7.9

Operating system (windows, osx, ...): OSX

Issue: When I read the following e2e testing story:

## id
* out_of_scope/other: hahaha
    - utter_out_of_scope/other

the story is read by rasa.shared.core.training_data.story_reader.markdown_story_reader.MarkdownStoryReader in a way that destroys the response key in the retrieval intent. Note that the key in the response action remains there as it should.

Command or request that led to error:

from rasa.shared.core.training_data.story_reader.markdown_story_reader import MarkdownStoryReader as reader
reader.read_from_file("story.md")

Note that this is closely tied to #7002 but applies to Markdown stories, not yaml.

[samsucik]

I managed to solve this for my use case by changing this line from

intent = {INTENT_NAME_KEY: parsed.get("intent")}

to

intent = {INTENT_NAME_KEY: parsed.get("intent_response_key", default=parsed.get("intent"))}

i.e. by using the full retrieval intent when available.

There may be other related edge case but at least in my case this seems to be a fix :-)