Blank files column uploads all files in "." when in update mode

[reliztrent]

If the upload csv:

• Has an object ID in "object_id"
• Has no value in "files"
• Has values filled out in all other required fields

e.g.:

files	title1	creator1	resource_type1	license1	first_file	object_id	keyword1	keyword2
	test title	test creator	Meeting Minutes	http://www.europeana.eu/portal/rights/rr-r.html	/home/racheltrent/batch-upload/faculty_senate_minutes/1960s/1961_1962_Faculty_Senate_Minutes/Faculty_Senate_Minutes_1961_01_13.pdf	gb19f6221	I'm a keyword	I'm also a keyword

Then:

• The uploader will upload all files (recursively) in "." (relative to the csv file) -- meaning all files in the same directory as the csv will be uploaded to the object.

[kerchner]

Requires gwu-libraries/scholarspace-hyrax#189