add checks to checkDesign process

Add checks to make sure there are no spaces or extra lines in design file.

assigned to @ghenry

changed milestone to %v2.1.5

added bug enhancement labels

@venkat.malladi can you give advice on this please... it is a try to fix the problem, or error out with an explanation question.

It is in checkDesign... @s181385 had an extra space at the end of the input design file... which checkDesign.py when writing into design.checked.csv converted into a new blank line... which cellranger mkfastq threw an error:

[error] Formatting error in sample sheet

I can do a check for spaces in any of the fields in the inputted design file (also blank spaces)... but the question is, do I remove spaces, or if detected cause an error that lets the user fix the issue themselves?

@ghenry I say remove trailing spaces in a column using .str.strip()

assigned to @s189701 and unassigned @ghenry

mentioned in commit c43e5767

mentioned in merge request !54 (merged)

closed via merge request !54 (merged)

closed via commit c43e5767

mentioned in commit 43e8ca42