HPCC-11487 Search Results defaults to "loading..." message

It should default to "Zero Rows" message until a search is performed.

Fixes HPCC-11487

Signed-off-by: Gordon Smith <gordon.smith@lexisnexis.com>
Merge pull request #5971 from GordonSmith/HPCC-11487

HPCC-11487 Search Results defaults to "loading..." message

Reviewed-By: Miguel Vazquez <miguel.vazquez@lexisnexis.com>
Reviewed-By: Richard Chapman <rchapman@hpccsystems.com>