无JIRA editor的watermark可以set为空

src/base/single/editor/editor.js

@@ -239,10 +239,11 @@ BI.Editor = BI.inherit(BI.Single, {
         return this.options.errorText;
     },
 
+    setWatermark: function (v) {
+        this.setWaterMark(v);
+    },
+
     setWaterMark: function (v) {
-        if (!BI.isKey(v)) {
-            return;
-        }
 
         this.options.watermark = v;