When TextBox with set MaxLength property has an EmptyMessage longer than MaxLength the form is not submitted in IE11.

Steps to reproduce:
1. Run the following code in IE11:

        <telerik:RadTextBox runat="server" ID="txbRelatedMessageVersion" Width="200px"
            MaxLength="10" EmptyMessage="Message Version" />

        <telerik:RadButton ID="amendBtn" runat="server"
            Text="Submit Page />

2. Click inside RadTextBox

3. Click the button

Result: the empty message is considered as a not valid value and the page is not submitted. Changing the MaxLenght to 15 will allow to submit the page successfully.