[16.0][FWD][FIX] queue_job: fix Delayable.__repr__

[simahawk]

It seems that sometimes jobs doesn't have a job_method and the repr failed

FWD port of #440
With better commit msg.

As the commit msg won't match I'd blacklist that PR for oca-port.

No need to backport to v15.

[OCA-git-bot]

Hi @guewen,
some modules you are maintaining are being modified, check this out!

[simahawk]

/ocabot merge patch

[OCA-git-bot]

On my way to merge this fine PR!
Prepared branch 16.0-ocabot-merge-pr-516-by-simahawk-bump-patch, awaiting test results.

[OCA-git-bot]

@simahawk your merge command was aborted due to failed check(s), which you can inspect on this commit of 16.0-ocabot-merge-pr-516-by-simahawk-bump-patch.

After fixing the problem, you can re-issue a merge command. Please refrain from merging manually as it will most probably make the target branch red.

[simahawk]

I'll fwd port changes from #519 before merging this, also because it seems this change was integrated in the chain dependencies mgmt.

[simahawk]

it was already in v15 here #487 I'll port that change w/ the others.