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When the upload field in asset admin fires off it's ajax request to check if the file already exists, (admin/assets/add/EditForm/field/AssetUploadField/fileexists), it doesn't pass on any information about what folder the file is attempting to be uploaded to, so the folder that the fileexists check checks against is always "/".
Other upload fields are fine but CMSFileAddController relies on the presence of a get param $ID to know what folder the file is being uploaded to.
FIX fileexists check via ajax didnt know what folder the file was bei…
…ng uploaded to. Fixes #950