remove kernel logo text placeholder

IPython/html/static/notebook/js/kernelselector.js

@@ -127,7 +127,6 @@ define([
             that.current_selection = data.name;
             $("#kernel_indicator").find('.kernel_indicator_name').text(data.display_name);
             that.element.find("img.current_kernel_logo").attr("src", that.notebook.base_url + "kernelspecs/" + data.name + "/logo-64x64.png");
-            that.element.find("div.current_kernel_logo").text(data.display_name.slice(0,1).toUpperCase());
         });
 
         this.events.on('kernel_created.Session', function(event, data) {
@@ -141,14 +140,11 @@ define([
         });
         
         var logo_img = this.element.find("img.current_kernel_logo");
-        var logo_div = this.element.find("div.current_kernel_logo");
         logo_img.on("load", function() {
-            logo_div.hide();
             logo_img.show();
         });
         logo_img.on("error", function() {
             logo_img.hide();
-            logo_div.show();
         });
     };
 

IPython/html/static/notebook/less/kernelselector.less

@@ -8,11 +8,4 @@
         width: 32px;
         height: 32px;
     }
-    
-    div.current_kernel_logo {
-        background-color: darken(@navbar-default-bg, 10%);
-        font-size: 24px;
-        text-align: center;
-        text-decoration: bold;
-    }
 }

IPython/html/static/style/style.min.css

@@ -9684,12 +9684,6 @@ select[multiple].celltoolbar select {
   width: 32px;
   height: 32px;
 }
-#kernel_logo_widget div.current_kernel_logo {
-  background-color: #dfdfdf;
-  font-size: 24px;
-  text-align: center;
-  text-decoration: bold;
-}
 #menubar {
   box-sizing: border-box;
   -moz-box-sizing: border-box;

IPython/html/templates/notebook.html

@@ -43,8 +43,7 @@ class="notebook_app"
 </span>
 
 <span id="kernel_logo_widget">
-  <img class="current_kernel_logo"/>
-  <div class="current_kernel_logo"></div>
+  <img class="current_kernel_logo" src=""/>
 </span>
 
 {% endblock headercontainer %}