ezimage datatype problems:

Export:

When contentobject does not have uploaded image package manager can make XML code like:

<simple-file key="007b667f362e9253017550adab1dae5c"
                original-path=""
                package-path="simplefiles/c132e720." />

in package.xml

Import:

When importing contentobject package with objects where ezimage attribute is empty, wizard will drop error:

Error: eZImageAliasHandler::initializeFromFile  	Apr 16 2007 13:13:49
The image '' does not exist, cannot initialize image attribute with it 

Missing is checking for file assignment.