Launch fhir-pipe on a resource with a filter that returns no result : replace the error by a warning

[nriss]

Context of the Issue

When creating a Resource on pyrog and then filtering, it is possible that the filtering is too stringeant, resulting that no line is returned.

Expected & current behavior

• Current behavior ; error message "Problem while running Fhirpipe: cannot call vectorize on size 0 inputs unless otypes is set"
• Expected behavior : show a warning message and FHIR-pipe continue to run on next resources

Steps to Reproduce (for bugs)

Create a resource and add a filter returning no results