Check whether view is null in OnMsgUpdateSelectionRange
Check whether view is null in OnMsgUpdateSelectionRange

In some case, the view in RenderViewHost is possible to be NULL
which cause segment fault


Former-commit-id: 615bd04c9e4b2a611bbb15c325b2bdce593be62c
meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser