Can't create/update buildpacks, "a filename must be specified"

kyle havlovitz <kylehav@...>

I'm having an issue where I can't upload any buildpack to cloudfoundry; it
says "The buildpack upload is invalid: a filename must be specified" and
the cf_trace confirms it's sending a null value for filename. The thing is,
I have specified a file name every time and get this error. I've used a few
different CLI versions and uploaded different buildpacks as both zip
files/directories, and nothing works. Is this a bug in the CLI/cloud
controller, or am I doing something wrong?

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