fix NPE after opening listbox with default profile
java.lang.NullPointerException
>>          at cz.datalite.zk.components.list.view.DLQuickFilter.fireChanges(DLQuickFilter.java:110)
>>          at cz.datalite.zk.components.list.DLListboxGeneralController.applyProfile(DLListboxGeneralController.java:759)
* version cz.datalite.zk-dl:ZKDLComponents 1.4.4.35