Improve error support

lib/errors/errors.coffee

@@ -1,9 +1,16 @@
+_ = require('lodash')
 TypedError = require('typed-error')
 log = require('../log/log')
 
 exports.NotFound = class NotFound extends TypedError
 	constructor: (name) ->
 		@message = "Couldn't find #{name}"
+		@code = 1
+
+exports.NotAny = class NotAny extends TypedError
+	constructor: (name) ->
+		@message = "You don't have any #{name}"
+		@code = 0
 
 exports.handle = (error, exit = true) ->
 	return if not error? or error not instanceof Error
@@ -11,4 +18,9 @@ exports.handle = (error, exit = true) ->
 	if error.message?
 		log.error(error.message)
 
-	process.exit(1) if exit
+	if _.isNumber(error.code)
+		errorCode = error.code
+	else
+		errorCode = 1
+
+	process.exit(errorCode) if exit

lib/errors/errors.spec.coffee

@@ -32,22 +32,30 @@ describe 'Errors:', ->
 			expect(logErrorStub).to.not.have.been.called
 			logErrorStub.restore()
 
-		checkProcessExitOption = (value, expectations) ->
+		checkProcessExitOption = (error, value, expectations) ->
 			processExitStub = sinon.stub(process, 'exit')
 			logErrorStub = sinon.stub(log, 'error')
-			errors.handle(new Error(MESSAGES.helloWorld), value)
+			errors.handle(error, value)
 			expectations(processExitStub)
 			processExitStub.restore()
 			logErrorStub.restore()
 
 		it 'should exit if the last parameter is true', ->
-			checkProcessExitOption true, (processExitStub) ->
-				expect(processExitStub).to.have.been.called
+			error = new Error(MESSAGES.helloWorld)
+			checkProcessExitOption error, true, (processExitStub) ->
+				expect(processExitStub).to.have.been.calledWith(1)
 
 		it 'should not exit if the last parameter is false', ->
-			checkProcessExitOption false, (processExitStub) ->
+			error = new Error(MESSAGES.helloWorld)
+			checkProcessExitOption error, false, (processExitStub) ->
 				expect(processExitStub).to.not.have.been.called
 
+		it 'should handle a custom error code from the error instance', ->
+			error = new Error()
+			error.code = 123
+			checkProcessExitOption error, true, (processExitStub) ->
+				expect(processExitStub).to.have.been.calledWith(123)
+
 	describe 'NotFound', ->
 
 		it 'should get a custom message', ->

lib/models/application.coffee

@@ -1,3 +1,4 @@
+_ = require('lodash')
 Promise = require('bluebird')
 canvas = require('./_canvas')
 errors = require('../errors/errors')
@@ -8,6 +9,11 @@ exports.getAll = ->
 		options:
 			orderby: 'app_name asc'
 			expand: 'device'
+	.then (applications) ->
+		if _.isEmpty(applications)
+			return Promise.reject(new errors.NotAny('applications'))
+
+		return applications
 
 exports.get = (id) ->
 	return canvas.get

lib/models/device.coffee

@@ -1,4 +1,7 @@
 canvas = require('./_canvas')
+_ = require('lodash')
+Promise = require('bluebird')
+errors = require('../errors/errors')
 
 exports.getAll = (applicationId) ->
 	return canvas.get
@@ -8,6 +11,11 @@ exports.getAll = (applicationId) ->
 				application: applicationId
 			expand: 'application'
 			orderby: 'name asc'
+	.then (devices) ->
+		if _.isEmpty(devices)
+			return Promise.reject(new errors.NotAny('devices'))
+
+		return devices
 
 exports.remove = (id) ->
 	return canvas.delete