• Please check if the PR fulfills these requirements
• The commit message follows our guidelines: https://github.com/angular/angular/blob/master/CONTRIBUTING.md#commit-message-format
• Tests for the changes have been added (for bug fixes / features)
• Docs have been added / updated (for bug fixes / features)
• What kind of change does this PR introduce? (Bug fix, feature, docs update, ...)
  fix template parser from not understanding <base> and <meta> tags
• What is the current behavior? (You can also link to an open issue here)
  HTML template parser doesn't recognize the element tags as self-closing
• What is the new behavior (if this is a feature change)?
  allows for <base> and <meta> to be self-closing
• Does this PR introduce a breaking change? (What changes might users need to make in their application due to this PR?)
  N/A
• Other information:

needed to parse index.html as a component template