SelectManyListbox Conversion error. Please Help

In my application, I have a selecteManyListbox, but the selections are entirely optional.
I have set required="false" in the component, still I see the message:
Conversion Error setting value "" for '#{Page1.selections}'.
The application works just fine if I select one or more options, so I do not think there is any problem in the code or the setup.
How do I skip any conversion errors, so that I can proceed without any selections?

Show your jsp page and source of the bean.

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