Only show 1st vs 3rd summary in HTML output if it has data and show default storage location for HTML ouput in help menu (#976)

lib/plugins/html/templates/url/pagexray/index.jade

@@ -42,7 +42,7 @@ h3 Requests and sizes per content type
       +sizeCell('contentSize', totalContentSize)
       +numberCell('requests', totalRequests)
 
-if pagexray.firstParty
+if pagexray.firstParty.requests
   h3 First Party vs Third Party
   .responsive
     table

lib/support/cli.js

@@ -243,7 +243,8 @@ module.exports.parseCommandLine = function parseCommandLine() {
       describe: 'Where you have your extra post tasks that will run after each URL is analyzed NOT YET IMPLEMENTED'
     })
     .option('outputFolder', {
-      describe: 'The folder name where the result will be stored. By default the name is generated using current_date/domain/filename'
+      describe: 'The folder name where the result will be stored. By default the name is generated using current_date/domain/filename',
+      default: 'sitespeed-result'
     })
     .option('firstParty', {
       describe: 'A regex running against each request and categorize it as first vs third party URL. (ex: ".*sitespeed.*")'