HPCC-8787 Refresh Page with a Invalid Hash String

Refreshing a page with an invalid (or out of date) "#" value would cause the
page to hang or to not display at all.

Fixes HPCC-8787

Signed-off-by: Gordon Smith <gordon.smith@lexisnexis.com>
Merge pull request #3957 from GordonSmith/HPCC-8787

HPCC-8787 RefreshPage and Invalid Hash

Reviewed-By: Richard Chapman <rchapman@hpccsystems.com>