Handling null values

Hello, I have just started using Freemarker.

I have a basic problem. How do I set the template to handle null values of
an int field of a pojo as String and display no values? 
Currently my template looks like:

Event: "${event.eventSource!""}","${event.eventType!""}

eventType is a int field of a pojo. If the field is null, Freemarker
displays 0 (default for int). I would like to change the behavior to display
an empty String. And no, I can't change the type to Integer.

Thanks
Luciano
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