My bad =D
Again, thanks for the help, all. 🙂
FYI - Here's the final product, works well; just in case it can help someone else.
declare @SQL nvarchar(max)
select @SQL = 'declare @MyQuery nvarchar(max) =
(select ''select count(*) as PropertyCount, '''''' + name + '''''' as DBName from '' + name + ''.sys.extended_properties union all ''
from sys.databases
where name not in (''master'', ''tempDB'', ''model'',''msdb'', ''ReportServer'', ''ReportServerTempDB'', ''rx'')
for xml path(''''))
set @MyQuery = ''select DBName from ('' + left(@MyQuery, len(@MyQuery) - 10) + '' )x where x.PropertyCount = 0 order by DBName''
exec sp_executesql @MyQuery'
execute (@SQL)