Uncaught TypeError: Cannot read property 'getPath' of undefined

1. Just try to execute it.
2. ...

**Atom Version**: 1.2.4
**System**: Mac OS X 10.10.5
**Thrown From**: [header-42](https://github.com/Kerosene2000/atom-header-42) package, v0.3.0
### Stack Trace

Uncaught TypeError: Cannot read property 'getPath' of undefined

```
At /Users/ssteiner/.atom/packages/header-42/lib/header-42.coffee:63

TypeError: Cannot read property 'getPath' of undefined
at Object.module.exports.Header42.getHeaderText (/Users/ssteiner/.atom/packages/header-42/lib/header-42.coffee:63:36)
at Object.module.exports.Header42.getHeader (/Users/ssteiner/.atom/packages/header-42/lib/header-42.coffee:71:21)
at Object.module.exports.Header42.insert (/Users/ssteiner/.atom/packages/header-42/lib/header-42.coffee:106:15)
at atom-workspace.subscriptions.add.atom.commands.add.header-42:insert (/Users/ssteiner/.atom/packages/header-42/lib/header-42.coffee:38:31)
at CommandRegistry.module.exports.CommandRegistry.handleCommandEvent (/Applications/Atom.app/Contents/Resources/app.asar/src/command-registry.js:260:29)
at /Applications/Atom.app/Contents/Resources/app.asar/src/command-registry.js:3:61
at CommandPaletteView.module.exports.CommandPaletteView.confirmed (/Applications/Atom.app/Contents/Resources/app.asar/node_modules/command-palette/lib/command-palette-view.js:159:32)
at CommandPaletteView.module.exports.SelectListView.confirmSelection (/Applications/Atom.app/Contents/Resources/app.asar/node_modules/atom-space-pen-views/lib/select-list-view.js:338:21)
at space-pen-div.atom.commands.add.core:confirm (/Applications/Atom.app/Contents/Resources/app.asar/node_modules/atom-space-pen-views/lib/select-list-view.js:109:19)
at CommandRegistry.module.exports.CommandRegistry.handleCommandEvent (/Applications/Atom.app/Contents/Resources/app.asar/src/command-registry.js:260:29)
at /Applications/Atom.app/Contents/Resources/app.asar/src/command-registry.js:3:61
at KeymapManager.module.exports.KeymapManager.dispatchCommandEvent (/Applications/Atom.app/Contents/Resources/app.asar/node_modules/atom-keymap/lib/keymap-manager.js:533:16)
at KeymapManager.module.exports.KeymapManager.handleKeyboardEvent (/Applications/Atom.app/Contents/Resources/app.asar/node_modules/atom-keymap/lib/keymap-manager.js:356:22)
at WindowEventHandler.module.exports.WindowEventHandler.handleDocumentKeydown (/Applications/Atom.app/Contents/Resources/app.asar/src/window-event-handler.js:99:36)
at HTMLDocument. (/Applications/Atom.app/Contents/Resources/app.asar/src/window-event-handler.js:3:61)
```
### Commands

```
5x -6:23 core:backspace (atom-text-editor.editor.is-focused)
-6:20 core:save (atom-text-editor.editor.is-focused)
-1:07.8.0 command-palette:toggle (ol.tree-view.full-menu.list-tree.has-collapsable-children.focusable-panel)
2x -0:58.1.0 core:move-down (atom-text-editor.editor.mini.is-focused)
-0:57.3.0 core:confirm (atom-text-editor.editor.mini.is-focused)
-0:57.3.0 settings-view:install-packages-and-themes (ol.tree-view.full-menu.list-tree.has-collapsable-children.focusable-panel)
-0:54 core:confirm (atom-text-editor.editor.mini.is-focused)
-0:30.9.0 command-palette:toggle (atom-text-editor.editor.is-focused)
-0:27.1.0 core:backspace (atom-text-editor.editor.mini.is-focused)
-0:25.5.0 core:confirm (atom-text-editor.editor.mini.is-focused)
-0:25.5.0 auto-header:generate (atom-text-editor.editor)
20x -0:23.5.0 core:move-up (atom-text-editor.editor.is-focused)
-0:05.7.0 command-palette:toggle (atom-workspace.workspace.scrollbars-visible-when-scrolling.theme-base16-tomorrow-dark-theme.theme-atom-dark-ui)
-0:01.6.0 core:confirm (atom-text-editor.editor.mini.is-focused)
-0:01.6.0 header-42:insert (atom-workspace.workspace.scrollbars-visible-when-scrolling.theme-base16-tomorrow-dark-theme.theme-atom-dark-ui)
```
### Config

``` json
{
"core": {
"disabledPackages": [
"metrics"
],
"themes": [
"atom-dark-ui",
"base16-tomorrow-dark-theme"
]
}
}
```
### Installed Packages

``` coffee
# User
Sublime-Style-Column-Selection, v1.3.0
atom-beautify, v0.28.19
auto-header, v0.2.4
block-comment, v0.4.3
block-cursor, v0.13.1
comment-headers, v2.13.0
commentcode, v0.1.0
header-42, v0.3.0
jshint, v1.8.3
linter, v1.11.3
minimap, v4.16.2
pigments, v0.19.1
sass-watch, v0.3.1

# Dev
No dev packages
```

Start at lib/header-42.coffee:63 and reproduce the failure by invoking the header-42:insert command, as shown in the stack trace. The work is done when that command no longer raises the reported TypeError.

Written by the indexing model from the issue text.