Seqera Platform CLI: handle failed tasks

[ahvigil]

fixes #2285 by checking for null d["complete"]

• This comment contains a description of changes (with reason)

• There is example tool output for tools in the https://github.com/MultiQC/test-data repository or attached to this PR
• Code is tested and works locally (including with --strict flag)
• docs/README.md is updated with link to below
• docs/modulename.md is created
• Everything that can be represented with a plot instead of a table is a plot
• Report sections have a description and help text (with self.add_section)
• There aren't any huge tables with > 6 columns (explain reasoning if so)
• Each table column has a different colour scale to its neighbour, which relates to the data (eg. if high numbers are bad, they're red)
• Module does not do any significant computational work

[ahvigil]

note that due to the dict comprehension on line 162, "complete" in d is always true... but I left this in here in case the above ever changes.

[vladsavelyev]

Thanks!