diff --git a/.rvmrc b/.rvmrc
deleted file mode 100644
index a11d225..0000000
--- a/.rvmrc
+++ /dev/null
@@ -1,5 +0,0 @@
-if [[ -n "$rvm_path/environments" && -s "$rvm_path/environments/ruby-1.9.2-p180@bb.mb" ]] ; then
-  \. "$rvm_path/environments/ruby-1.9.2-p180@bb.mb"
-else
-  rvm --create  "ruby-1.9.2-p180@bb.mb"
-fi
diff --git a/backbone.modelbinding.js b/backbone.modelbinding.js
index db1f68c..b68a15b 100644
--- a/backbone.modelbinding.js
+++ b/backbone.modelbinding.js
@@ -98,15 +98,15 @@ var modelbinding = (function(Backbone, _, $) {
       }
     }
 
-    this.getBindingAttr = function(type){ 
-      return this.bindingAttrConfig[type]; 
-    };
+  };
 
-    this.getBindingValue = function(element, type){
-      var bindingAttr = this.getBindingAttr(type);
-      return element.attr(bindingAttr);
-    };
+  modelBinding.Configuration.prototype.getBindingAttr = function(type){
+    return this.bindingAttrConfig[type];
+  };
 
+  modelBinding.Configuration.prototype.getBindingValue = function(element, type){
+    var bindingAttr = this.getBindingAttr(type);
+    return element.attr(bindingAttr);
   };
 
   modelBinding.Configuration.bindindAttrConfig = {
@@ -424,10 +424,14 @@ var modelbinding = (function(Backbone, _, $) {
       val = modelBinding.Configuration.getDataBindSubst(attr, val);
       switch(attr){
         case "html":
-          element.html(val);
+          if ((typeof val !== 'undefined') && (val !== null)) {
+              element.html(val);
+          }
           break;
         case "text":
-          element.text(val);
+          if ((typeof val !== 'undefined') && (val !== null)) {
+              element.text(val);
+          }
           break;
         case "enabled":
           element.attr("disabled", !val);