Intended behavior of empty samplesheet with missing sections

[golharam]

One of our lab operators provided an empty samplesheet intending to fill it out later, but never did. As a result, this run made it into our pipeline where we use this package to read the samplesheet. The samplesheet provided is:

[Data],,,,,,,,,
Sample_ID,Sample_Name,Sample_Plate,Sample_Well,I7_Index_ID,index,I5_Index_ID,index2,Sample_Project,Description

No other sections, and no samples. When I loaded this samplesheet using

from sample_sheet import SampleSheet as IlluminaSampleSheet
ss = IlluminaSampleSheet(sample_sheet_path)

no error was thrown. Is that the intended behavior?

[clintval]

I believe the other mandatory section headers must be present even in the case of a truly empty sample sheet. I am currently re-working how validations are performed to make them modular and user-controlled (and user-extended) to solve #96 and #108. Once that's ready, it will be far easier to turn on/off and extend sample sheet validations.