Add default to map filter if attribute is not defined

[Yannik]

It would be great if the map filter would return an optional default value if the attribute is not defined.

Example:

list_of_dicts|map(attribute='version', default='5.6')

[esaezgil]

Hi @DanyC97 and @Yannik thanks for raising this! :) it's been so long that the MR has conflicts. I will try to solve them asap

[wedi]

Are there any news regarding this feature? Why was the pulled request closed? Should someone else take over or is this just undesired?

[esaezgil]

I closed the pull request myself as I do not have any further interest pursuing it. Please feel free to contribute with another PR.

[akamac]

I would love to see this implemented

[shashanksingh28]

Working on this in Pycon 2019 Sprints

[kbiggers]

#1018

[flexferrum]

Is it a good idea to add 'default' param to the 'attr' filter as well? As a shorthand for someVal | attr('someAttr') | default(10)