Fixes #11663 - Empty lookup value not validated when use_puppet_default is checked
(cherry picked from commit baa21c791a8b8a3cbbc9f1a21a1cfe2448730800)
Fixes #11663 - Empty lookup value not validated when use_puppet_default is checked
(cherry picked from commit baa21c791a8b8a3cbbc9f1a21a1cfe2448730800)