Failed to activate the node-resolver package

[Enter steps to reproduce:]

1. Install `node-resolver`

**Atom**: 1.18.0 x64
**Electron**: 1.3.15
**OS**: Mac OS X 10.12.5
**Thrown From**: [node-resolver](git://github.com/hughsk/atom-node-resolver) package 1.0.1

### Stack Trace

Failed to activate the node-resolver package

```
At Cannot read property 'command' of undefined

TypeError: Cannot read property 'command' of undefined
at Object.exports.activate (/packages/node-resolver/index.js:12:21)
at Package.module.exports.Package.activateNow (/Applications/Atom.app/Contents/Resources/app/src/package.js:253:25)
at /Applications/Atom.app/Contents/Resources/app/src/package.js:225:38
at Package.module.exports.Package.measure (/Applications/Atom.app/Contents/Resources/app/src/package.js:99:21)
at /Applications/Atom.app/Contents/Resources/app/src/package.js:218:32
at Package.module.exports.Package.activate (/Applications/Atom.app/Contents/Resources/app/src/package.js:215:40)
at PackageManager.module.exports.PackageManager.activatePackage (/Applications/Atom.app/Contents/Resources/app/src/package-manager.js:645:40)
at /Applications/Atom.app/Contents/Resources/app/node_modules/settings-view/lib/package-manager.js:519:35
at exit (/Applications/Atom.app/Contents/Resources/app/node_modules/settings-view/lib/package-manager.js:128:22)
at triggerExitCallback (/Applications/Atom.app/Contents/Resources/app/src/buffered-process.js:338:17)
at ChildProcess. (/Applications/Atom.app/Contents/Resources/app/src/buffered-process.js:368:17)
at emitTwo (events.js:106:13)
at ChildProcess.emit (events.js:191:7)
at Process.ChildProcess._handle.onexit (internal/child_process.js:215:12)
```

### Commands

```
-3:36.2.0 settings-view:open (input.hidden-input)
-2:47.8.0 core:backspace (input.hidden-input)
-0:37.9.0 core:confirm (input.hidden-input)
-0:31.8.0 core:backspace (input.hidden-input)
2x -0:29.5.0 core:confirm (input.hidden-input)
```

### Non-Core Packages

```
atomify 0.3.0
minimap-plus 4.29.1
node-debugger 1.10.1
node-resolver 1.0.1
```