dygraph range selector does not go away when input is NULL

The application I am making produces a dygraph in the dashboard body when an input is selected (for example year input). The dygraph won't show if there is no input (default), i.e.
input$year=="". However the dygraph does not complete disappear as some bits of the range selector are still showing when there is no input, as shown in the screenshow below (the sliders can be seen below the warning message).

Is it possible to hide the dygraph range selector when there is no input selected?

Thanks.

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