trollflow2 falsely claims all files generated successfully

[gerritholl]

Describe the bug

I have three products in my product list. Two are successfully produced and one fails to be produced. In the logfile, trollflow2 reports: "all 2 files produced nominally". It would rather be more useful if it noted that two files were produced nominally and one failed.

To Reproduce

product_list:
  output_dir:
    /data/pytroll/OUTBOXES/generic/
  subscribe_topics:
    - /set/fci/fdss
  reader:
    - fci_l1c_nc
  mask_area: False
  delay_composites: True
  use_tmp_file: False
  staging_zone: /data/pytroll/TMP/staging
  cache_dir: /data/pytroll/TMP/cache
  resampler: null
  radius_of_influence: 60000
  scene_load_kwargs:
    upper_right_corner:
      NE
  areas:
    null:
      areaname: fulldisc
      products:

        'dwd_vis04':
          productname: dwd_vis04
          formats: &config
            - writer: geotiff
              fname_pattern: "{platform_name}-{productname}-{areaname}-{start_time:%Y%m%d_%H%M}-{end_time:%H%M}-devel.tif"
              nbits: 8
              tiled: True
              blockxsize: 512
              blockysize: 512
              compress: lzw
              predictor: 2
              fill_value: 0

        'true_color_raw':
          productname: true_color_raw
          formats: *config

        'convection':
          productname: convection
          formats: *config

workers:
  - fun: !!python/name:trollflow2.plugins.create_scene
  - fun: !!python/name:trollflow2.plugins.load_composites
  - fun: !!python/name:trollflow2.plugins.resample
  - fun: !!python/name:trollflow2.plugins.save_datasets

running with:

satpy_launcher.py -m /tmp/test-message test-pl.yaml

Expected behavior

I expect one composite to fail: the convection composite requires a mixture of 1 km and 2 km channels. I am not resampling in the example playlist. Indeed, Satpy logs a warning message as expected:

[WARNING: 2022-07-29 14:10:56 : satpy.scene] The following datasets were not created and may require resampling to be generated: DataID(name='convection')

I expect that trollflow2 does not claim that all files were produced nominally.

Actual results

trollflow2 claims that all files were produced nominally:

[WARNING: 2022-07-29 14:10:57 : trollflow2.plugins] Skipping convection: "No dataset matching 'DataQuery(name='convection')' found"
/opt/pytroll/pytroll_inst/mambaforge/envs/pytroll-py310/lib/python3.10/site-packages/dask/core.py:119: RuntimeWarning: invalid value encountered in log
  return func(*(_execute_task(a, cache) for a in args))
[DEBUG: 2022-07-29 14:11:14 : trollflow2.launcher] Cleaning up
[INFO: 2022-07-29 14:11:15 : trollflow2.launcher] All 2 files produced nominally in 0:00:35.071999

Environment Info:

• Trollflow2 Version: 0.13.5.dev30+gb9400c3
• Satpy Version: 0.36.1.dev192+g15dbf3db
• Pyresample Version: 1.24.1

Additional context
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