Argument 1 Cannot be null

[GoogleCodeExporter]

Steps to reproduce the issue.
1. Install google api toolkit (as per instruction).
2. Use it in simple demo application like mentioned in 
"http://wiki.developerforce.com/page/Google_Data_APIs_Schema_Demo"
3. When the application is executed. It brings the authenticated spreadsheets 
from the google drive.
4. Select the appropriate spreadsheet.
5. Select the object to extract.
6. It shows , "Argument 1 cannot be null" error. And application halts

The fix that I found was in the GoogleData Class, getRelLink(xmldom.element e, 
string rtype ) method. The line
if( ee.getAttribute('rel') == rtype) had to be changed to 
if (ee.getAttribute('rel') == rtype.replace('https','http') and it fixed the 
issue.

I am using Salesforce Developer Org, API version 27 and Summer 13 level.

Original issue reported on code.google.com by auyo...@gmail.com on 5 Jun 2013 at 8:45