fix(eslint-plugin-template): [prefer-self-closing-tags] do not treat comments as whitespace #2256
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Fixes #1715
Due to a template parse error that was being suppressed, the valid test case for comments was incorrectly passing.
Comments do not appear in the syntax tree, so we cannot look at the child nodes to determine whether an element is empty. Instead, we need to look at the source code and get the text between the end of the start tag and the start of the end tag. If that is only whitespace, then the element is truly empty.