Isn't it like using a variable without declaring that is what you are 
expecting? And why null checks should be treated specially? From the 
perspective of script validation, I think what is happening is logical.

I can imagine scenarios where the current behaviour can create problem. When 
the variables are passed from some other class, it will not send a property 
which that class does not have. In such a case the default value of the 
variable should be considered. 

I would wish to have a feature to declare variables at the process definition 
scope and assign some default value to it. So if we do not have the variable at 
the runtime, the execution can move on with the declared default value.

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