WebConsole configMgr saves an empty value in list properites

1. Launch the Webconsole Configuration Manager and navigate to a configuration that contains an empty list property.
2. Save the configuration without modifying.
3. Upon saving, the list properties that were previously without any values will now be updated to include an empty value.

eg: Apache Sling Service User Mapper Service (org.apache.sling.serviceusermapping.impl.ServiceUserMapperImpl) in AEM
If configuration without any change is:

:org.apache.felix.configadmin.revision:=L"1"
require.validation=B"true"
service.pid="org.apache.sling.serviceusermapping.impl.ServiceUserMapperImpl"
user.enable.default.mapping=B"false"

After saving it becomes:

:org.apache.felix.configadmin.revision:=L"8"
require.validation=B"true"
required.principal.validators=[ \
  "", \
  ]
required.user.validators=[ \
  "", \
  ]
service.pid="org.apache.sling.serviceusermapping.impl.ServiceUserMapperImpl"
user.default=""
user.enable.default.mapping=B"false"

required.principal.validators and required.user.validators have empty values in it.