RootName and RootNamespace become "" instead of null when changes are made to Launch Wizard

[adedoyinNteligen]

Closes #1554

Description

When you open the launch wizard, and create a new config and save, when you go back to the original config the rootname and rootnamespace will be " " instead of null. This leads to a Namespace error when you run the extension

This issue will be fixed with my MR to add wizard support for tunables. But in the case that a user added "null" or "" to the launch.json, the debugger would fail to run. This can be a seperate issue if the scope is going to be larger.

Steps to Reproduce

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1. Go to launch wizard

2. Click on new config

3. Name the config and save

4. Go back to launch wizard and select the new config

4. In my branch there were scenarios where I ran into "" as well as "null"

]

Expected Behavior

We expect null value. Not null string, or " ". DFDL is expecting a null value specifically

Actual Behavior

It seems we are getting empty " " and in some scenarios "null"

Additional Notes and Screenshots (optional)

Environment

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• Operating System(s): Linux

• Browser/VS Code version:

• Extension version:

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