Can not add document type with Matadata set

• Type: Regression Bug
• Status: Closed
• Resolution: Duplicate
• Affects Version/s: 7.0.0 M3
• Fix Version/s: 7.0.0 M4
• Component/s: Documentation, Documents & Media
• Labels: None

Steps to reproduce:

1. Go to Administration>Documents and Media.
2. Click Manage > Document Types.
3. Add a document type with a metadata (Meeting Metadata).
4. Click Save.

Expected result:
The document type can be saved without error.

Actual result:
There is no response when press "Save" button.