Failed to activate the node-resolver package

[Enter steps to reproduce:]

1. install the package

**Atom**: 1.16.0 x64
**Electron**: 1.3.13
**OS**: Mac OS X 10.12.4
**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 (/app.asar/src/package.js:218:19)
at /app.asar/src/package.js:190:32
at Package.module.exports.Package.measure (/app.asar/src/package.js:96:15)
at /app.asar/src/package.js:183:26
at Package.module.exports.Package.activate (/app.asar/src/package.js:180:34)
at PackageManager.module.exports.PackageManager.activatePackage (/app.asar/src/package-manager.js:550:34)
at /app.asar/node_modules/settings-view/lib/package-manager.js:484:29
at exit (/app.asar/node_modules/settings-view/lib/package-manager.js:99:16)
at triggerExitCallback (/app.asar/src/buffered-process.js:322:11)
at /app.asar/src/buffered-process.js:335:11
at /app.asar/src/buffered-process.js:204:9)
at emitOne (events.js:101:20)
at Socket.emit (events.js:188:7)
at Pipe._handle.close [as _onclose] (net.js:493:12)
```

### Commands

```
-5:18.4.0 tree-view:add-folder (ol.tree-view.full-menu.list-tree.has-collapsable-children.focusable-panel)
-5:15.1.0 core:confirm (input.hidden-input)
-5:12.8.0 application:new-file (ol.tree-view.full-menu.list-tree.has-collapsable-children.focusable-panel)
-5:10.7.0 core:paste (input.hidden-input)
2x -5:09.1.0 core:save (input.hidden-input)
-4:44.9.0 tree-view:move (span.name.icon.icon-file-text)
-4:44.8.0 core:move-right (input.hidden-input)
-4:42.7.0 core:confirm (input.hidden-input)
2x -3:29.4.0 editor:newline (input.hidden-input)
-3:19.8.0 core:paste (input.hidden-input)
-0:36.8.0 core:confirm (input.hidden-input)
```

### Non-Core Packages

```
language-fish-shell 1.0.5
node-resolver 1.0.1
```