[SPARKL-123] getUnavailableIds.ktr: use 'REGEXP .+' instead of '<> no value'
[SPARKL-123] getUnavailableIds.ktr: use 'REGEXP .+' instead of '<> no value'

This comparison is safer, and will work regardless of the setting of
KETTLE_EMPTY_STRING_DIFFERS_FROM_NULL in our kettle.properties file.

marcovala/sparkl,afrjorge/sparkl,webdetails/sparkl,diogofscmariano/sparkl,diogofscmariano/sparkl,Tiger66639/sparkl,gretchiemoran/sparkl,Tiger66639/sparkl,gretchiemoran/sparkl,afrjorge/sparkl,pedrofvteixeira/sparkl,carlosrusso/sparkl,carlosrusso/sparkl,pedrofvteixeira/sparkl,webdetails/sparkl,marcovala/sparkl