Imported empty stacks contain blocks that were in the previous stacks #70
Description
This is an example XML file exported with the Migration Tool. The first stack contains a content block, and the second stack is empty.
<?xml version="1.0" encoding="UTF-8"?>
<concrete5-cif version="1.0">
<stacks>
<stack name="Test Stack 1" path="/">
<area name="Main">
<blocks>
<block type="content" name="">
<data table="btContentLocal">
<record>
<content><![CDATA[<p>This is a content block in Test Stack 1</p>
]]></content>
</record>
</data>
</block>
</blocks>
</area>
</stack>
<stack name="Test Stack 2" path="/"/>
</stacks>
</concrete5-cif>
However, the imported second stack contains a content block that was present in the first stack when the XML file was imported.
