For csv-based project lists, link_url field doesn't update properly

[verythorough]

Our brigade, OpenSMC, uses a google sheets csv file to curate our project list. For reference, our results in the cfapi can be found here.

Many of our projects don't have websites yet, so the link_url field in the csv is blank. I've discovered that this causes some unintended results in the cfapi, depending on whether fields are (or were) completed in the csv, the project repo (using the Edit button at the top of the repo page), or in the parent repo if the project is forked:

csv link_url	project repo homepage	(if forked) project parent homepage	cfapi link_url	working as intended?
filled	any	any	csv value	yes
empty (never filled)	empty	empty or not forked	null	yes
empty (never filled)	filled	any	repo value	maybe?
empty (never filled)	empty	filled	parent value	probably not
empty, but previously filled	any	any	last filled csv value	no

In one half-hearted attempt, I tried entering "" or null in the csv for two of the projects. Of course, the cfapi just interpreted these as strings and displayed them as such. Now that I've deleted those values, they remain in the cfapi, as described in the last row of the table.

I've taken a peek at run_update.py, but haven't pinpointed the source of the issue yet.

[ondrae]

Weird. I'll check it out. In the meantime I reloaded your projects to get rid of that "null". The empty "" is still there for now though.