Fix crash when a touch is sent before eventFilter is installed
requested to merge sunweaver/lomiri-ui-toolkit:mr/fix-crash-when-touch-is-sent-before-eventFilter-installed into master
TouchRegistry may receive a released touch event for a touch that happened before its eventFilter is installed, which means it's possible to not have a touch info for the point. Guard access to looked-up touchInfo so that we don't crash.