.html files without <body> element explode

1. create a file with a `.html` extension using the project tree view

**Atom**: 1.24.0 x64
**Electron**: 1.6.16
**OS**: Mac OS X 10.13.3
**Thrown From**: Atom Core


### Stack Trace

Uncaught TypeError: this.registry.startIdForScope is not a function

```
At /Applications/Atom.app/Contents/Resources/app/node_modules/first-mate/lib/grammar.js:324

TypeError: this.registry.startIdForScope is not a function
    at Grammar.module.exports.Grammar.startIdForScope (/Applications/Atom.app/Contents/Resources/app/node_modules/first-mate/lib/grammar.js:324:34)
    at Grammar.module.exports.Grammar.tokenizeLine (/Applications/Atom.app/Contents/Resources/app/node_modules/first-mate/lib/grammar.js:150:32)
    at TextMateLanguageMode.buildTokenizedLineForRowWithText (/Applications/Atom.app/Contents/Resources/app/src/text-mate-language-mode.js:407:50)
    at TextMateLanguageMode.buildTokenizedLineForRow (/Applications/Atom.app/Contents/Resources/app/src/text-mate-language-mode.js:402:23)
    at TextMateLanguageMode.tokenizeNextChunk (/Applications/Atom.app/Contents/Resources/app/src/text-mate-language-mode.js:290:47)
    at _.defer (/Applications/Atom.app/Contents/Resources/app/src/text-mate-language-mode.js:274:63)
    at /Applications/Atom.app/Contents/Resources/app/node_modules/underscore/underscore.js:666:53
```

### Commands

```
     -3:44.9.0 fuzzy-finder:toggle-file-finder (input.hidden-input)
     -3:43.5.0 editor:consolidate-selections (input.hidden-input)
     -3:43.5.0 core:cancel (input.hidden-input)
     -3:04.2.0 core:paste (input.hidden-input)
     -2:26.7.0 core:close (input.hidden-input)
     -2:25.4.0 pane:show-item-1 (input.hidden-input)
     -2:24.6.0 pane:show-item-3 (input.hidden-input)
     -0:09.9.0 pane:show-item-1 (atom-workspace.workspace.scrollbars-visible-when-scrolling.theme-solarized-light-syntax.theme-one-dark-ui)
     -0:09.5.0 pane:show-item-2 (atom-workspace.workspace.scrollbars-visible-when-scrolling.theme-solarized-light-syntax.theme-one-dark-ui)
     -0:08.8.0 pane:show-item-3 (atom-workspace.workspace.scrollbars-visible-when-scrolling.theme-solarized-light-syntax.theme-one-dark-ui)
     -0:08.1.0 pane:show-item-4 (atom-workspace.workspace.scrollbars-visible-when-scrolling.theme-solarized-light-syntax.theme-one-dark-ui)
     -0:07.7.0 pane:show-item-5 (atom-workspace.workspace.scrollbars-visible-when-scrolling.theme-solarized-light-syntax.theme-one-dark-ui)
```

### Non-Core Packages

```
atom-underscore 0.1.3 
busy-signal 1.4.3 
change-case 0.6.5 
intentions 1.1.5 
pigments 0.40.2 
recent-files-fuzzy-finder 0.4.0 
rspec 0.4.0 
```



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.html files without <body> element explode #16820

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Uh oh!

.html files without <body> element explode #16820

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