Issue 1:
[Enter steps to reproduce below:]

...

...

Atom Version: 0.187.0

System: Mac OS X 10.9.5

Thrown From: Atom Core

Stack Trace

Failed to activate the atom-lint package

At Cannot read property 'previous' of undefined

TypeError: Cannot read property 'previous' of undefined
at /Users/hi0711/.atom/packages/atom-lint/lib/atom-lint.coffee:60:59
at Config.module.exports.Config.observeKeyPath (/opt/homebrew-cask/Caskroom/atom/latest/Atom.app/Contents/Resources/app/src/config.js:621:7)
at Config.module.exports.Config.observe (/opt/homebrew-cask/Caskroom/atom/latest/Atom.app/Contents/Resources/app/src/config.js:133:21)
at Function.module.exports.Config.observe (/Users/hi0711/.atom/packages/atom-lint/lib/config.coffee:38:26)
at Object.module.exports.enable (/Users/hi0711/.atom/packages/atom-lint/lib/atom-lint.coffee:57:47)
at Object.module.exports.activate (/Users/hi0711/.atom/packages/atom-lint/lib/atom-lint.coffee:29:19)
at Package.module.exports.Package.activateNow (/opt/homebrew-cask/Caskroom/atom/latest/Atom.app/Contents/Resources/app/src/package.js:240:19)
at /opt/homebrew-cask/Caskroom/atom/latest/Atom.app/Contents/Resources/app/src/package.js:221:30
at Package.module.exports.Package.measure (/opt/homebrew-cask/Caskroom/atom/latest/Atom.app/Contents/Resources/app/src/package.js:167:15)
at Package.module.exports.Package.activate (/opt/homebrew-cask/Caskroom/atom/latest/Atom.app/Contents/Resources/app/src/package.js:214:14)

Commands

Config

{
"core": {},
"editor": {
"showInvisibles": true,
"showIndentGuide": true,
"softWrap": true,
"invisibles": {}
}
}

Installed Packages

# User
atom-color-highlight, v2.0.14
atom-lint, v0.20.0
autocomplete-paths, v0.9.0
autocomplete-plus, v0.22.14
autocomplete-snippets, v0.3.1
emmet, v2.3.2
file-icons, v1.4.3
japanese-wrap, v0.2.3
tag, v0.2.3

# Dev
No dev packages

Issue 2:
[Enter steps to reproduce below:]

...

...

Atom Version: 0.187.0

System: Mac OS X 10.9.5

Thrown From: atom-lint package, v0.20.1

Stack Trace

Failed to activate the atom-lint package

At Cannot read property 'previous' of undefined

TypeError: Cannot read property 'previous' of undefined
at /Users/DanielH/.atom/packages/atom-lint/lib/atom-lint.coffee:37:59
at Config.module.exports.Config.observeKeyPath (/Applications/Atom.app/Contents/Resources/app/src/config.js:621:7)
at Config.module.exports.Config.observe (/Applications/Atom.app/Contents/Resources/app/src/config.js:133:21)
at Function.module.exports.Config.observe (/Users/DanielH/.atom/packages/atom-lint/lib/config.coffee:25:17)
at Object.module.exports.enable (/Users/DanielH/.atom/packages/atom-lint/lib/atom-lint.coffee:36:34)
at Object.module.exports.activate (/Users/DanielH/.atom/packages/atom-lint/lib/atom-lint.coffee:17:6)
at Package.module.exports.Package.activateNow (/Applications/Atom.app/Contents/Resources/app/src/package.js:240:19)
at /Applications/Atom.app/Contents/Resources/app/src/package.js:221:30
at Package.module.exports.Package.measure (/Applications/Atom.app/Contents/Resources/app/src/package.js:167:15)
at Package.module.exports.Package.activate (/Applications/Atom.app/Contents/Resources/app/src/package.js:214:14)
at PackageManager.module.exports.PackageManager.activatePackage (/Applications/Atom.app/Contents/Resources/app/src/package-manager.js:465:21)
at /Applications/Atom.app/Contents/Resources/app/node_modules/settings-view/lib/package-manager.js:226:29
at exit (/Applications/Atom.app/Contents/Resources/app/node_modules/settings-view/lib/package-manager.js:43:16)
at BufferedProcess.triggerExitCallback (/Applications/Atom.app/Contents/Resources/app/src/buffered-process.js:63:47)
at /Applications/Atom.app/Contents/Resources/app/src/buffered-process.js:77:18
at Socket.<anonymous> (/Applications/Atom.app/Contents/Resources/app/src/buffered-process.js:150:18)
at Socket.emit (events.js:138:20)
at Pipe.close (net.js:477:12)

Commands

-0:22.0 settings-view:check-for-package-updates (atom-workspace.workspace.scrollbars-visible-when-scrolling.theme-atom-dark-syntax.theme-atom-dark-ui)

Config

{
"core": {
"disabledPackages": [
"jshint",
"jslint"
]
}
}

Installed Packages

# User
atom-handlebars, v0.3.38
atom-jshint, v1.4.3
atom-lint, v0.20.1
linter-rubocop, v0.2.2

# Dev
No dev packages