When I create a Google Charts Line Chart with one row, it doesn't show anything:
http://jsfiddle.net/bensinclair/zyMSd/2/ (excuse the messy code, the only way I could get it to work was to put the JavaScirpt in the HTML box)
But then with exactly the same code and adding another row to the chart, it works:
http://jsfiddle.net/bensinclair/KnVQh/
Am I missing something here?