Import tab should handle server error

No errors are displayed when creating documents through the import tab and there is a validation error on a property, furthermore, the creation dialog is closed and a toaster saying Created document is displayed.

The server error responds with a bad request error, it should be handled and the user should be notified about this error.

Steps To Reproduce:

1. Inside a workspace, click on plus sign to create documents
2. Click on Import tab
3. Upload a file
4. Click on Add properties button
5. Select File as type
6. Enter 2000+ characters description
7. Click on create

Actual:

• The dialog is closed and a toast with a successful message is displayed

Expected:

• The dialog is not closed and the user is warned about the server error