HPCC-11625 Submitting Roxie Query in ECL Playground fails

Added support for general exception.
Ignore \r\n within XML parse.
Result can not be opened, closed and reopened

Fixes HPCC-11625

Signed-off-by: Gordon Smith <gordon.smith@lexisnexis.com>
Merge pull request #6025 from GordonSmith/HPCC-11625

HPCC-11625 Submitting Roxie Query in ECL Playground fails
Reviewed-By: Miguel Vazquez <miguel.vazquez@lexisnexis.com>
Reviewed-By: Richard Chapman <rchapman@hpccsystems.com>