Silent SQL failures when there is no root folder

[npirlot]

Error: Executing action method EJ2APIServices.Controllers.SQLProviderController.SQLFileOperations (EJ2SQLDataBaseProvider) - Validation state: Valid
System.Data.SqlClient.SqlException (0x80131904): The parameterized query '(@name nvarchar(8),@ParentID nvarchar(4000),@SiZe int,@IsFile bi' expects the parameter '@ParentID', which was not supplied.

Steps to reproduce:

• cloned Git Repo, and built + ran project in VS2019.
• opened mdf file in VS2019, and executed query to DELETE all entries in the Product table.
• in File Manager (showing empty info), tried to create a new folder.

Expected behaviour:

• create a directory in the root of the virtual file system
• alternatively: SQL error is "silent" as there is no feedback to user, but result of action yields same as initial load of the File Manager. An error is however visible in the Output log in VS2019 for the web-server (i.e. the error handling should be improved to feedback to end user).

I will have to focus on my project's integration to work for now, but if I have a shareable solution to suggest, I'll add them here with a PR.
Note that similarly, trying to upload a file in the context of having no root directory also fails (silently, with no error details in either user feedback or output console).