Bug: error when deleting event from non visible day

[mserralta]

kalendar/src/lib-components/kalendar-weekview.vue

Line 211 in 1543b60

         this.$refs[targetRef][0].removeEvent({ id, key }); 

We can have events on a day which is not "on screen" right now. If we try to remove these events out of our current week view TypeError is raised. No reference to object.