Fixed empty keys dropdown text after new key was mined.

src/webview/scripts.js

@@ -604,8 +604,12 @@ function refreshKeysMenu() {
     links.innerHTML = buf;
     if (currentSelectedKey >= 0) {
         var cur_name = document.getElementById("keys_current_name");
+        if (keysLoaded[currentSelectedKey].file_name == "") {
+            cur_name.innerHTML = "[Not saved]";
+        } else {
             cur_name.innerHTML = keysLoaded[currentSelectedKey].file_name;
         }
+    }
 }
 
 function keysChanged(json) {