Global default expression/variable value policy

Hello,

   I wonder whether there is a way how to set a default variable policy
globally in FreeMarker. Consider these cases, when myVar has null value:

1. ${myVar!""} <#-- prints empty string -->
2. ${myVar} <#-- throws exception -->

   This NULL treatment is very good for development and test environments,
but for production I'd like the second example to not throw exception but
instead print some default value (such as empty string). My experience is
that developers (webdesigners in my case) despite all the testing efforts
often "forget" to define default values even for non mandatory things. This
finally leads to errors in production that could be many times avoided if I
have chance to set a strategy how to behave when retrieving variable value
fails due to not specified default.

   Is there any extension point how can I plug in some custom logic for this
use case?

Thanks for any advices,
Jan

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