Fix issue where row_number starts from 3 on a job report download

[imdadahad]

This fixes an issue where a job report download starts with a row_number of 3.

Issue

We were originally checking to see if a row_number existed with if dict.get('row_number').... This however evaluated to False if a row_number was 0. We were also incrementing the row number by 2 in the format, so the minimum number we could ever format to was 3.

Fix

Changed the format to explicitly check for 0 and ensure we only increment by 1. The ensures if a row number is:

None -> ''
0 -> 1
1 -> 2
...

[leohemsted]

pretty sure this can be simplified, because row_num will never be not None but not >= 0 (ie: a negative number)

row_num = '' if row_num is None else row_num + 1

or alternatively if you prefer the full layout

if row_num is None:
    row_num = ''
else:
    row_num += 1

[imdadahad]

👍