[Issue 6389] Loading project fails when done several times

http://argouml.tigris.org/issues/show_bug.cgi?id=6389






------- Additional comments from [email protected] Tue Dec  6 23:20:28 -0800 2011 -------
Reproduce this by:
Prepare an empty zargo project.
1. Start ArgoMLU.
2. Load the project by selecting the MRU in the file menu.
3. Load again.
4. Load again.
The 3rd load fails with the exception message.
Just load - no save needed.

Now the model contains 2 Models: 

<XMI.content>
    <UML:Model xmi.id = '127-0-0-2--571941f3:13414400bc3:-8000:000000000000097B'
      name = 'tModel97B' isSpecification = 'false' isRoot = 'false' isLeaf = 'false'
      isAbstract = 'false'/>
    <UML:Model xmi.id = '127-0-0-2-75b574c0:134175b90b4:-8000:0000000000001354'
      name = 'untitledModel' isSpecification = 'false' isRoot = 'false' isLeaf =
'false'
      isAbstract = 'false'/>
  </XMI.content>


From the exceptions I deduce that the namespace of a new diagram is set to a
Model that was already deleted. That operation fails, but after the failure, we
still have 2 Models...(according the XMI dump above).

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