Fix case when registry does not exist

[alkuzad]

WinReg path is added after first installation of custom Docset and closing Zeal. Use default for this case

Describe Your Changes:

If there is no key, use default

Linked Issues:

Change Type

Category

• This is a Minor Change which does not fit any other category.
• This is a Bugfix
• This is a Feature Addition
• This is a CI Change
• This is a Documentation-Only Change (do not check any of the above boxes if this box is checked)

Breaking/Non Breaking

• This is a Breaking Change
• This is a Non-Breaking Change

Reasoning

Seems that the value in Registry is created only after first custom doc installation and closing program. In this case we have to use assumed default. User still can change location in UI and this won't impact zeal-cli config, but this is on the user to move data and change config.

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[Morpheus636]

LGTM!