Updated Zend_Gdata BooksBrowser demo to check whether a query parameter exists before trying to do something with it. Since not all of these were set by the search form, this was consistently creating runtime errors.
Updated Zend_Gdata BooksBrowser demo to check whether a query parameter exists
before trying to do something with it. Since not all of these were set by the
search form, this was consistently creating runtime errors.

Review by: rboyd


git-svn-id: abaeb2b3ba5a94ed391a9405ad7d63d0414021c9@11831 44c647ce-9c0f-0410-b52a-842ac1e357ba

sandsmedia/zf,sandsmedia/zf,sandsmedia/zf,grzana12/ZendFramework,grzana12/ZendFramework,grzana12/ZendFramework,grzana12/ZendFramework