Fix #filtered_entries so it returns a new Array if the directory doesn't exist

features/support/env.rb

@@ -24,7 +24,7 @@ def jekyll_run_output
 end
 
 def run_jekyll(args, output_file)
-  command = "#{JEKYLL_PATH} #{args} > #{jekyll_output_file} 2>&1"
+  command = "#{JEKYLL_PATH} #{args} --trace > #{jekyll_output_file} 2>&1"
   system command
 end
 

lib/jekyll/collection.rb

@@ -49,6 +49,7 @@ module Jekyll
     #
     # Returns a list of filtered entry paths.
     def filtered_entries
+      return Array.new unless exists?
       Dir.chdir(directory) do
         entry_filter.filter(entries)
       end