Resolved column validation (Issue #74)

[eshantri]

In order to test this I removed "start_date" column from "input_files/experiments.csv" file and ran curl -F "fileName=@input_files/experiments.csv" \ http://localhost:5001/yaba/v1/experiments?username=guestuser , as expected it gave the following error-

I tested the same on other routes as well and all gave expected errors on missing the required columns.

[dlebauer]

Thanks @eshantri !!

[im-prakher]

@dlebauer The linter test was first failing for this pull request whereas when I reverted this pr, the tests were running fine. Also, I created an empty test commit that was running fine on my forked repository but the same error occurred when I created the pr on YABA repo. Take a look at #88

[im-prakher]

Is it possible, since the forked repo eshantri:master has been deleted, it might be creating trouble for upcoming PR's after this?

[dlebauer]

Certainly possible - but I think it is always okay to delete a branch after it has been merged.

it seemed to also be complaining about a missing commit / incomplete git history in the PR.