fix(datepicker): Don't emit input if value date is disabled

Author: mst101

src/components/Datepicker.vue

@@ -613,7 +613,6 @@ export default {
 
         if (isDateDisabled) {
           parsedValue = null
-          this.$emit('input', parsedValue)
         }
         this.setValue(parsedValue)
       }

test/unit/specs/Datepicker/Datepicker.spec.js

@@ -267,7 +267,6 @@ describe('Datepicker shallowMounted', () => {
     })
 
     expect(wrapperTemp.vm.selectedDate).toEqual(null)
-    expect(wrapperTemp.emitted('input')).toBeTruthy()
 
     wrapperTemp.destroy()
   })