Fix bug making provider fallthrough to pkgcloud when a directory doesn't exist, making a very unintuitive error.

lib/factory.js

@@ -6,15 +6,17 @@
 function createClient(options) {
     options = options || {};
     var provider = options.provider || 'filesystem';
+    var handler;
 
     try {
         // Try to load the provider from providers folder
-        provider = require('./providers/' + provider);
-        return provider.createClient(options);
+        handler = require('./providers/' + provider);
     } catch (err) {
         // Fall back to pkgcloud
-        return require('pkgcloud').storage.createClient(options);
+        handler = require('pkgcloud').storage;
     }
+    
+    return handler.createClient(options);
 }
 
 /**

lib/providers/filesystem/index.js

@@ -18,6 +18,10 @@ module.exports.createClient = function (options) {
 function FileSystemProvider(options) {
     options = options || {};
     this.root = options.root;
+    var exists = fs.existsSync(this.root);
+    if (!exists) {
+        throw new Error('Path does not exist: ' + this.root);
+    }
     var stat = fs.statSync(this.root);
     if (!stat.isDirectory()) {
         throw new Error('Invalid directory: ' + this.root);