Bugfix: [LDC-500] Fix unserialize error

## Ready State: Yes|No

#### JIRA Reference: https://imagex.atlassian.net/browse/LDC-500

Patch for contrib module Flickr. Removes an unserialize error.

## Requirements & Dependencies
* Requires pull request #.

## Deployment Instructions

* Merge code.
* Clear caches with `drush cache-clear all`