Uncaught TypeError: Cannot read property 'isModified' of undefined

[Enter steps to reproduce below:]
1. ...
2. ...

**Atom Version**: 1.2.3
**System**: Microsoft Windows 10 Pro
**Thrown From**: [go-imports](https://github.com/abiosoft/atom-go-imports) package, v0.1.1
### Stack Trace

Uncaught TypeError: Cannot read property 'isModified' of undefined

```
At /C:/Users/Ameen/.atom/packages/go-imports/lib/go-imports.coffee:31

TypeError: Cannot read property 'isModified' of undefined
at Object.module.exports.process (file:///C:/Users/Ameen/.atom/packages/go-imports/lib/go-imports.coffee:20:30)
at atom-text-editor.subscriptions.add.atom.commands.add.go-imports:process (file:///C:/Users/Ameen/.atom/packages/go-imports/lib/go-imports.coffee:13:88)
at CommandRegistry.module.exports.CommandRegistry.handleCommandEvent (C:\Users\Ameen\AppData\Local\atom\app-1.2.3\resources\app.asar\src\command-registry.js:260:29)
at CommandRegistry.handleCommandEvent (C:\Users\Ameen\AppData\Local\atom\app-1.2.3\resources\app.asar\src\command-registry.js:3:61)
at CommandRegistry.module.exports.CommandRegistry.dispatch (C:\Users\Ameen\AppData\Local\atom\app-1.2.3\resources\app.asar\src\command-registry.js:160:19)
at AtomEnvironment.module.exports.AtomEnvironment.dispatchApplicationMenuCommand (C:\Users\Ameen\AppData\Local\atom\app-1.2.3\resources\app.asar\src\atom-environment.js:987:28)
at emitOne (events.js:77:13)
at EventEmitter.emit (events.js:169:7)
```
### Commands

```
-0:03.4.0 go-imports:process (atom-text-editor.editor.mini.is-focused)
```
### Config

``` json
{
"core": {},
"go-imports": {}
}
```
### Installed Packages

``` coffee
# User
go-imports, v0.1.1
go-plus, v3.5.2

# Dev
No dev packages
```