Hide tooltip if binding is null

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One way to hide an empty tooltip for all controls is to create a style in a resource dictionary that is included in your App.xaml.
This style sets the visibility to collapsed when the tooltip is an empty string or null:

<!-- Style to hide tool tips that have an empty content. -->
<Style TargetType="ToolTip">
    <Style.Triggers>
        <Trigger Property="Content"
                 Value="{x:Static sys:String.Empty}">
            <Setter Property="Visibility"
                    Value="Collapsed" />
        </Trigger>
        <Trigger Property="Content"
                 Value="{x:Null}">
            <Setter Property="Visibility"
                    Value="Collapsed" />
        </Trigger>
    </Style.Triggers>
</Style>

Also include sys namespace (for String.Empty):

xmlns:sys="clr-namespace:System;assembly=mscorlib"

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