Add edge case handling for undefined styles

.travis.yml

@@ -13,6 +13,4 @@ node_js:
   - "0.8"
 script:
   - npm install
-  - npm install if-node-version
-  - if-node-version ">=4" "./node_modules/.bin/eslint . "
   - npm test

lib/colors.js

@@ -105,7 +105,7 @@ function applyStyle() {
   var args = Array.prototype.slice.call(arguments);
 
   var str = args.map(function(arg) {
-    if (arg.constructor === String) {
+    if (arg !== undefined && arg.constructor === String) {
       return arg;
     } else {
       return util.inspect(arg);

package.json

@@ -1,7 +1,7 @@
 {
     "name": "colors",
     "description": "get colors in your node.js console",
-    "version": "1.2.4",
+    "version": "1.2.5",
     "author": "Marak Squires",
     "homepage": "https://github.com/Marak/colors.js",
     "bugs": "https://github.com/Marak/colors.js/issues",