set password to empty string only if password is not already set
reset position fixed from commit 4e65c324646053f4c56eb8a7e34d2e0faf3eeaf4 - the lightbox isnt scoll-able with position fixed
show 404 if asset doesn't exist instead of an exception
don't directly output, use response object

fixes problem when access denied header should be sent with json request but was not possible as output started already
Use childSelect also for getRecursiveChildComponent
fix clear-cache of media and assets thru component/clear-cache
clear media cache for login and welcome images