NPE when searching for available imports - seems to be caused by corruption of 
internal model
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                 Key: FELIX-2159
                 URL: https://issues.apache.org/jira/browse/FELIX-2159
             Project: Felix
          Issue Type: Bug
          Components: Sigil
            Reporter: David Savage
            Priority: Minor


java.lang.NullPointerException
        at 
org.apache.felix.sigil.core.internal.model.osgi.PackageExport.equals(PackageExport.java:178)
        at java.util.ArrayList.indexOf(ArrayList.java:216)
        at java.util.ArrayList.contains(ArrayList.java:199)
        at 
org.apache.felix.sigil.ui.eclipse.ui.util.BackgroundLoadingSelectionDialog.addElements(BackgroundLoadingSelectionDialog.java:476)
        at 
org.apache.felix.sigil.ui.eclipse.ui.util.ExportedPackageFinder$1.visit(ExportedPackageFinder.java:65)
        at 
org.apache.felix.sigil.model.AbstractCompoundModelElement.visit(AbstractCompoundModelElement.java:88)
        at 
org.apache.felix.sigil.model.AbstractCompoundModelElement.visit(AbstractCompoundModelElement.java:94)
        at 
org.apache.felix.sigil.repository.AbstractRepositoryManager$2.visit(AbstractRepositoryManager.java:398)
        at 
org.apache.felix.sigil.obr.impl.CachingOBRBundleRepository.accept(CachingOBRBundleRepository.java:46)
        at 
org.apache.felix.sigil.repository.AbstractBundleRepository.accept(AbstractBundleRepository.java:94)
        at 
org.apache.felix.sigil.repository.AbstractRepositoryManager.visit(AbstractRepositoryManager.java:403)
        at 
org.apache.felix.sigil.ui.eclipse.ui.util.ExportedPackageFinder.run(ExportedPackageFinder.java:72)
        at 
org.apache.felix.sigil.ui.eclipse.ui.util.BackgroundLoadingSelectionDialog$3.run(BackgroundLoadingSelectionDialog.java:223)
        at org.eclipse.core.internal.jobs.Worker.run(Worker.java:55)

Debug of situation shows the following package is causing the problem. 
Inspecting the source of the sigil.properties file showed no such export...

PackageExport[M:null:uses=[Ljava.lang.String;@706b633d]



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