Scanpy import fails due to fields starting with underscore

[pcm32]

Trying on an AnnData object that we generate we got the following error:

INFO:root:Reading sample names from /private/var/folders/23/wwh84vd95rncnf5mx753cpgh0000gp/T/tmp_1zll3p7/job_working_directory/000/2/working/outdir/meta.tsv
Traceback (most recent call last):
  File "/Users/pmoreno/miniconda3/envs/__ucsc-cell-browser@0.7.15/bin/cbImportScanpy", line 10, in <module>
    sys.exit(cbImportScanpyCli())
  File "/Users/pmoreno/miniconda/envs/__ucsc-cell-browser@0.7.15/lib/python3.9/site-packages/cellbrowser/convert.py", line 604, in cbImportScanpyCli
    build(outDir, options.htmlDir, port=options.port)
  File "/Users/pmoreno/miniconda/envs/__ucsc-cell-browser@0.7.15/lib/python3.9/site-packages/cellbrowser/cellbrowser.py", line 4392, in build
    convertDataset(inDir, inConf, outConf, datasetDir, redo)
  File "/Users/pmoreno/miniconda/envs/__ucsc-cell-browser@0.7.15/lib/python3.9/site-packages/cellbrowser/cellbrowser.py", line 3749, in convertDataset
    sampleNames, needFilterMatrix = convertMeta(inDir, inConf, outConf, datasetDir, outMetaFname)
  File "/Users/pmoreno/miniconda/envs/__ucsc-cell-browser@0.7.15/lib/python3.9/site-packages/cellbrowser/cellbrowser.py", line 3412, in convertMeta
    sampleNames, needFilterMatrix = metaReorder(matrixFname, metaFname, finalMetaFname)
  File "/Users/pmoreno/miniconda/envs/__ucsc-cell-browser@0.7.15/lib/python3.9/site-packages/cellbrowser/cellbrowser.py", line 2195, in metaReorder
    metaSampleNames = readSampleNames(metaFname)
  File "/Users/pmoreno/miniconda/envs/__ucsc-cell-browser@0.7.15/lib/python3.9/site-packages/cellbrowser/cellbrowser.py", line 3061, in readSampleNames
    for row in lineFileNextRow(fname, noHeaders=False):
  File "/Users/pmoreno/miniconda/envs/__ucsc-cell-browser@0.7.15/lib/python3.9/site-packages/cellbrowser/cellbrowser.py", line 668, in lineFileNextRow
    Record = namedtuple('tsvCsvRec', headers)
  File "/Users/pmoreno/miniconda/envs/__ucsc-cell-browser@0.7.15/lib/python3.9/collections/__init__.py", line 399, in namedtuple
    raise ValueError('Field names cannot start with an underscore: '
ValueError: Field names cannot start with an underscore: '_is_in_cluster__'

This is with latest release version 0.7.15

Also, it would be nice if cbImportScanpy would fail with an error code when it fails. In this the tool fails silently (no error code) and Galaxy hence thinks that the import was succesful.

[pcm32]

This should be easy to handle in the method that you have to sanitise the headers I presume.

[pcm32]

Sorted by #209