More informative error messages for assembly failures

[bede]

Viridian often provides informative error messages in the result field of the logfile. However we've noticed that the majority of Viridian errors being reported in GPAS are just "Error". Perhaps this is a fallback catch-all message for unhandled error conditions. It would be great if more informative errors could be provided in these cases. It sounds like this may already have been done in unreleased code?

Below is a JSON excerpt showing an example:

 "run_summary" :
{
  "last_stage_completed" : "Finished",
  "command" : "/usr/local/bin/viridian_workflow run_one_sample --tech illumina --ref_fasta ref.fa --reads1 88cde614-8238-a637-6b39-227b2773935e_1.fastq.gz --reads2 88cde614-8238-a637-6b39-227b2773935e_2.fastq.gz --outdir 88cde614-8238-a637-6b39-227b2773935e_outdir/ --sample_name 88cde614-8238-a637-6b39-227b2773935e --keep_bam",
  "options" :
  {
    "debug" : false,
    "tech" : "illumina",
    "built_in_amp_schemes" : null,
    "amp_schemes_tsv" : null,
    "reads1" : "88cde614-8238-a637-6b39-227b2773935e_1.fastq.gz",
    "reads2" : "88cde614-8238-a637-6b39-227b2773935e_2.fastq.gz",
    "reads" : null,
    "ref_fasta" : "ref.fa",
    "sample_name" : "88cde614-8238-a637-6b39-227b2773935e",
    "outdir" : "88cde614-8238-a637-6b39-227b2773935e_outdir/"
  },
  "cwd" : "/tmp/nxf.2b9Xupr7E6",
  "version" : "0.3.7",
  "finished_running" : true,
  "start_time" : "2022-08-26T15:27:09",
  "end_time" : "2022-08-26T15:30:09",
  "hostname" : "nf-004907cc7d1df01dd3ef499dfef14fda",
  "result" : "Error",
  "run_time" : "0:02:28.799040"
},