Fix Uncaught TypeError: Cannot read property 'length' of undefined

Fix Uncaught TypeError: Cannot read property 'length' of undefined
Update datatype.js

I have an error with IE10 loading the app. Nothing appears because of the cookies. The cookie cart_count is undefined so the strip method returns an error (lstrip).
The solution to this error was to check if the string is empty before trying to strip it.
Merge pull request #289 from MaxMorais/patch-1

[minor] Fix Uncaught TypeError: Cannot read property 'length' of undefined
Merge pull request #290 from miguelfontanes/master

[minor] Update strip method of datatype.js to handle null/undefined
enlist as site only if dir
fix wnf.py --mysql
[minor] report disk usage 0 if files path does not exist
[minor] replace 'raise e' with 'raise' for correct tracebacks
[minor] lib/wnf.py --python command to start python with path and database connection
[minor] [plugins] fix in plugin path
[website] table of contents in web page
[minor] optimized webnotes.has_permission
[minor] check permission for editable web page
[minor] [fix] website.js and rss
[minor] on save and trash, clear cache of website, if it contains table of contents
Merge branch 'documentation-website' of github.com:webnotes/wnframework into documentation-website

Conflicts:
	website/doctype/web_page/web_page.py