instantiate uses isDefined when not necessary?

[scorfield]

Reported on the forums:

This code fails:

<instantiate class="contacts" object="myFusebox.getApplication().getApplicationData().Contacts" arguments="globals.datasource" />
<invoke object="myFusebox.getApplication().getApplicationData().Contacts" methodcall="addtocontact(attributes)" returnvariable="myvar" />

It causes isDefined() to be called on the dotted-name which is illegal.

Actually I suspect this is only true of similar code that uses overwrite="false". Still, it would be nice to be able to store objects / results to such an expression.

[scorfield]

This only happens with overwrite="false" so deferring to 5.6 to figure out a clean way to handle it.