HPCC-8567 ECLPlayground Sample Drop Down Error

In Chrome, if there is no graph control installed, the drop down sample list will not show.

Fixes HPCC-8567

Signed-off-by: Gordon Smith <gordon.smith@lexisnexis.com>
Merge pull request #3859 from GordonSmith/HPCC-8567

HPCC-8567 ECLPlayground Sample Drop Down Error

Reviewed-By: Richard Chapman <rchapman@hpccsystems.com>