npe when trying to resolve namespace import in composite model resolver

[kelvin goodson]

I'm seeing an NPE here

        // No definition found, delegate the resolution to the imports
        for (Import import_ : this.contribution.getImports()) {
            if (import_ instanceof NamespaceImport) {
                NamespaceImport namespaceImport = (NamespaceImport)import_;
                if
(namespaceImport.getNamespace().equals(qname.getNamespaceURI())) {

                    // Delegate the resolution to the import resolver
======>           resolved =
namespaceImport.getModelResolver().resolveModel(Composite.class,
(Composite)unresolved);
                    if (!resolved.isUnresolved()) {
                        return modelClass.cast(resolved);
                    }
                }
            }
        }

because the result of getModelResolver() is null

I'm digging into it,  but I'm learning what the code does so it's
taking me a little while.  Has anyone else seen this and have an
insight as to why its happening.  It's probably a config thing in my
eclipse env.

cheers, Kelvin.