Fix kanban UI issues

www/kanban/app-kanban.less

@@ -74,6 +74,9 @@
                 #kanban-edit {
                     font-weight: bold;
                 }
+                &:hover {
+                    cursor: move;
+                }
             }
         }
 

www/kanban/inner.js

@@ -184,6 +184,9 @@ define([
                 var save = function () {
                     // Store the value
                     var name = $input.val();
+                    if (!name || !name.trim()) {
+                        return kanban.onChange();
+                    }
                     // Remove the input
                     $(el).text(name);
                     // Save the value for the correct board

www/kanban/jkanban.css

@@ -36,6 +36,7 @@
     margin: 0;
     padding: 0;
     display: inline;
+    cursor: text;
 }
 
 .kanban-board header .kanban-title-button {

www/kanban/jkanban.js

@@ -151,9 +151,6 @@
                                 return handle.classList.contains('kanban-item');
                             },
                             accepts: function (el, target, source, sibling) {
-                                if (sibling === null) {
-                                    return false;
-                                }
                                 if (self.options.readOnly) { return false; }
                                 return true;
                             },