HPCC-9803 New ECL Watch does not support existing visualisations

Fixes HPCC-9803

Signed-off-by: Gordon Smith <gordon.smith@lexisnexis.com>
Merge pull request #4977 from GordonSmith/HPCC-9803

HPCC-9803 New ECL Watch does not support existing visualisations

Reviewed-By: Miguel Vazquez <miguel.vazquez@lexisnexis.com>
Reviewed-By: Richard Chapman <rchapman@hpccsystems.com>