fix: parser error on empty markup string, causing WSOD #179
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What:
Bugfix related to #161
The Guard was modified now the Error is thrown if rootNode isn't in scope and markup is not a
typeof
"string"Why:
The parser was triggering true when all the HTML was removed from the codemirror by the user.
Checklist:
Screenshot before the fix applied on live site (in original bug report)

Screenshot locally running with fix applied and the HTML manually removed

Tests ran after the fix is applied.
