Initial key completions for requirements expressed as dict do not work

[Deleted user]

This is probably a general problem with LOM values, where record types enclosed in a list have correct key completions, but when enclosed in a dict do not have correct key completions for the first value.

e.g.

requirements:
  DockerRequirement:
    d

doesn't give the expected auto-completions

while

requirements:
  - class: DockerRequirement
    d

does.