Support a URL address as FOOTER_ORGANIZATION_LOGO

Description

Hi,
this is a fix for the problem reported in this [google-groups thread](https://groups.google.com/d/msg/openedx-ops/dPqg9Qwa41M/hWJ2eQbkBgAJ)

More information:
without this code change it is not possible to give an absolute URL to the FOOTER_ORGANIZATION_LOGO in settings. doing so will produce an HTTP 500 error in homepage and any other place `branding.api.get_footer()` has been called.

@ormsbee could you please take a look?

Assignee

Nimisha Asthagiri

Reporter

Open Source Pull Request Bot

Labels

Contributor Name

Mahyar Damavand

Repo

edx/edx-platform

Customer

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