Lp 1749593: Fix TypeError: Cannot set property 'grid' of undefined

Lp 1749593: Fix TypeError: Cannot set property 'grid' of undefined

Commit b35f0c0 added a reference to the grid in the grid.dataProvider
in services/grid.js in the web staff client.  This is great, but the
dataProvider could be undefined where it was being set.  This leads to
busted grid views and a TypeError in the console.

This commit moves the code down until after a fallback dataProvider is
used when the dataProvider is undefined and thereby avoids both
problems of adding the grid to an undefined dataProvider.

Signed-off-by: Jason Stephenson <jason@sigio.com>