Sitecore 8 - Document Manager is blank in Rich Text Editor

Environment: Sitecore 8.0 rev 150621

Sitecore Rich Text Editor allows to link a document to a link. So the idea is to download the linked document when the particular link is clicked.
To link the document you have to use the Sitecore Rich Text Editor (RTE). But when you trying to link the document using the Document Manager in the Sitecore RTE it is blank as bellow.

I have raised a Sitecore support ticket and this issue reported as a bug in Sitecore.

They have provided the following workaround to overcome this issue.

1. Open the /Website/sitecore/shell/Controls/Rich Text Editor/EditorPage.aspx file
2. Find the following text part and replace it:

MediaManager-ViewPaths="/media library"
TemplateManager-UploadPaths="/media library"

with this one:

MediaManager-ViewPaths="/media library"
DocumentManager-DeletePaths="/"
DocumentManager-ViewPaths="/"
TemplateManager-UploadPaths="/media library"

3. Clear browsers cache and try the issue again.
Let us know if you have any issue with the Document Manager.