OG_Sync gives fatal error if User is Anonymous
When creating or updating an Organic Group page, if the Author is set to Anonymous or left blank, the OG_Sync module throws a Fatal Error. This can be seen as line 224 of the civicrm_og_sync.module file in the attached backtrace. Anonymous is a valid entry for Author on the Drupal form, and should not throw this error. We have a number of occurrences of this where the Group Page has been converted from a previous normal page not using OG, and the original Author had been deleted or otherwise set to Anonymous.
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