Description of problem:
The Application#retrieveAllApplications() returns a collection of
Application instances. Except that, because it uses the same database
table as the c.a.kernel.Resource class, it also includes instances of
objects which are not Applications, eg Portals & Portlets. This causes
an Assertion to fail in the ApplicationCollection class. For example:

        ApplicationCollection apps = 
            Application.retrieveAllApplications();
        
        while (apps.next()) {
            Application app = apps.getApplication();
            ... do stuff ...
        }

Results in:

com.arsdigita.util.AssertionError: Value of application is null.
        at com.arsdigita.util.Assert.error(Assert.java:532)
        at com.arsdigita.util.Assert.assertTrue(Assert.java:372)
        at com.arsdigita.util.Assert.assertNotNull(Assert.java:396)
        at
com.arsdigita.web.ApplicationCollection.getApplication(ApplicationCollection.java:99)
        at
com.arsdigita.london.util.cmd.SiteMapList.doRun(SiteMapList.java:39)
        at com.arsdigita.london.util.Program.run(Program.java:221)
        at
com.arsdigita.london.util.cmd.SiteMapList.main(SiteMapList.java:56)
Error: Value of application is null.

When it hits the first non-Application object.

Version-Release number of selected component (if applicable):


How reproducible:


Steps to Reproduce:
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Actual results:


Expected results:


Additional info: