Prevent group names of length < 5 when updating settings

This restriction does not apply to admins.

app/controllers/groups_controller.rb

@@ -18,7 +18,8 @@ class GroupsController < Groups::ApplicationController
 
   before_action :user_actions, only: [:show, :subgroups]
 
-  before_filter :validate_name, only: :create
+  before_filter :validate_name, only: [:create, :update]
+
 
   skip_cross_project_access_check :index, :new, :create, :edit, :update,
                                   :destroy, :projects
@@ -187,10 +188,15 @@ def user_actions
   end
 
   def validate_name
-    @group = Group.new(group_params)
-    unless @group.path.empty? || @group.path.length > 4 || current_user.admin?
+    group = Group.new(group_params)
+    unless group.path.empty? || group.path.length > 4 || current_user.admin?
       flash.now[:alert] = 'Path must have at least a length of 5.'
-      render action: "new"
+      if action_name == 'update'
+        render action: 'edit'
+      else
+        @group = group
+        render action: 'new'
+      end
     end
   end