fix #283

src/InputFile.vue

@@ -19,7 +19,7 @@ export default {
       this.$parent.addInputFile(e.target)
       if (e.target.files) {
         e.target.value = ''
-        if (!/safari/i.test(navigator.userAgent)) {
+        if (e.target.files.length && !/safari/i.test(navigator.userAgent)) {
           e.target.type = ''
           e.target.type = 'file'
         }