fix: update build

Author: vinayakkulkarni

dist/vue-mapbox-geocoder.common.js

@@ -1532,8 +1532,8 @@ var geocoderEvents = {
   },
   watch: {
     input: {
-      handler: function handler(next) {
-        if (this.control && next) {
+      handler: function handler(next, prev) {
+        if (this.control && next !== prev) {
           this.control.setInput(next);
         }
       },

dist/vue-mapbox-geocoder.umd.js

@@ -1541,8 +1541,8 @@ var geocoderEvents = {
   },
   watch: {
     input: {
-      handler: function handler(next) {
-        if (this.control && next) {
+      handler: function handler(next, prev) {
+        if (this.control && next !== prev) {
           this.control.setInput(next);
         }
       },