Blank page when accessing dashboard after upgrade or site import failure - global description does not exist

2008-11-17 17:26:49,468 ERROR [[ACTIVE] ExecuteThread: '0' for queue:
 'weblogic.kernel.Default (self-tuning)'] [confluence.util.velocity.VelocityUtils] getRenderedTemplate 
Error occurred rendering template: /decorators/main.vmd
 -- url: /confluence/dashboard.action | userName: admin

org.apache.velocity.exception.MethodInvocationException: Invocation of method 'getAttachment' 
in  class $Proxy49 threw exception java.lang.IllegalArgumentException: Content entity object 
should not be null @ /decorators/main.vmd[3,33]
	at org.apache.velocity.runtime.parser.node.ASTMethod.execute(ASTMethod.java:286)
	...
	at org.apache.velocity.runtime.directive.VelocimacroProxy.render(VelocimacroProxy.java:194)
        ...
	at org.apache.velocity.Template.merge(Template.java:254)
	at com.atlassian.confluence.util.velocity.VelocityUtils.
getRenderedTemplateWithoutSwallowingErrors(VelocityUtils.java:58)
	at com.atlassian.confluence.util.velocity.VelocityUtils.getRenderedTemplate(VelocityUtils.java:36)
	at com.atlassian.confluence.util.profiling.ProfilingPageFilter.
applyDecoratorUsingVelocity(ProfilingPageFilter.java:133)
	...
Caused by: java.lang.IllegalArgumentException: Content entity object should not be null
	at org.springframework.util.Assert.notNull(Assert.java:112)
	at com.atlassian.confluence.pages.persistence.dao.hibernate.AbstractHibernateAttachmentDao.
getLatestVersionsOfAttachments(AbstractHibernateAttachmentDao.java:78)
	at com.atlassian.confluence.pages.DefaultAttachmentManager.
getLatestVersionsOfAttachments(DefaultAttachmentManager.java:63)
	at com.atlassian.confluence.pages.AbstractAttachmentManager.
getAttachment(AbstractAttachmentManager.java:51)
	at com.atlassian.confluence.pages.AbstractAttachmentManager.
getAttachment(AbstractAttachmentManager.java:32)