Last mod date on workshops layout

[mjcollin]

This:

Last updated: <time datetime="{{ page.date | date_to_xmlschema }}" itemprop="datePublished"> {{ page.date | date: "%b %-d, %Y" }} </time>

Results in this error:

The page build failed with the following error:

The value 'nil' was passed to a date-related filter that expects valid dates in /_layouts/workshop.html or one of its layouts. For more information, see https://help.github.com/articles/page-build-failed-date-is-not-a-valid-datetime/.

For information on troubleshooting Jekyll see:

https://help.github.com/articles/troubleshooting-jekyll-builds

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