Add parse handling for stray/unnecessary VS16s

2/scripts/generate

@@ -836,7 +836,7 @@ function createTwemoji(re) {
             iconId = grabTheRightIcon(rawText);
             i = index + rawText.length;
             src = options.callback(iconId, options);
-            if (src) {
+            if (iconId && src) {
               img = new Image();
               img.onerror = options.onerror;
               img.setAttribute('draggable', 'false');
@@ -897,7 +897,7 @@ function createTwemoji(re) {
             src = options.callback(iconId, options),
             attrib,
             attrname;
-          if (src) {
+          if (iconId && src) {
             // recycle the match string replacing the emoji
             // with its image counter part
             ret = '<img '.concat(

2/test/test.js

@@ -534,7 +534,35 @@ wru.test([{
       div.firstChild.src === 'https://twemoji.maxcdn.com/2/72x72/2639.png'
     );
   }
-}, {
+},{
+  name: 'lone vs16s',
+  test: function () {
+    wru.assert('are not parsed in strings',
+     twemoji.parse('\ufe0f') === '\ufe0f'
+    );
+
+    var div = document.createElement('div');
+    div.innerHTML = '\ufe0f';
+    twemoji.parse(div);
+    wru.assert('are not parsed in nodes',
+      div.innerHTML === '\ufe0f'
+    );
+  }
+},{
+  name: 'unnecessary vs16s',
+  test: function () {
+    wru.assert('are not parsed in strings',
+     twemoji.parse('\ud83d\ude10\ufe0f') === '<img class="emoji" draggable="false" alt="\ud83d\ude10" src="https://twemoji.maxcdn.com/2/72x72/1f610.png"/>\ufe0f'
+    );
+
+    var div = document.createElement('div');
+    div.innerHTML = '\ud83d\ude10\ufe0f';
+    twemoji.parse(div);
+    wru.assert('are not parsed in nodes',
+      div.children.length === 1 && div.innerText === '\ufe0f'
+    );
+  }
+},{
   name: 'multiple parsing using a callback',
   test: function () {
     wru.assert(

2/twemoji.amd.js

@@ -374,7 +374,7 @@ define(function () {
           iconId = grabTheRightIcon(rawText);
           i = index + rawText.length;
           src = options.callback(iconId, options);
-          if (src) {
+          if (iconId && src) {
             img = new Image();
             img.onerror = options.onerror;
             img.setAttribute('draggable', 'false');
@@ -435,7 +435,7 @@ define(function () {
           src = options.callback(iconId, options),
           attrib,
           attrname;
-        if (src) {
+        if (iconId && src) {
           // recycle the match string replacing the emoji
           // with its image counter part
           ret = '<img '.concat(

2/twemoji.js

@@ -373,7 +373,7 @@ var twemoji = (function (
         iconId = grabTheRightIcon(rawText);
         i = index + rawText.length;
         src = options.callback(iconId, options);
-        if (src) {
+        if (iconId && src) {
           img = new Image();
           img.onerror = options.onerror;
           img.setAttribute('draggable', 'false');
@@ -434,7 +434,7 @@ var twemoji = (function (
         src = options.callback(iconId, options),
         attrib,
         attrname;
-      if (src) {
+      if (iconId && src) {
         // recycle the match string replacing the emoji
         // with its image counter part
         ret = '<img '.concat(

2/twemoji.npm.js

@@ -374,7 +374,7 @@ var twemoji = (function (
         iconId = grabTheRightIcon(rawText);
         i = index + rawText.length;
         src = options.callback(iconId, options);
-        if (src) {
+        if (iconId && src) {
           img = new Image();
           img.onerror = options.onerror;
           img.setAttribute('draggable', 'false');
@@ -435,7 +435,7 @@ var twemoji = (function (
         src = options.callback(iconId, options),
         attrib,
         attrname;
-      if (src) {
+      if (iconId && src) {
         // recycle the match string replacing the emoji
         // with its image counter part
         ret = '<img '.concat(