Anonymous users unable to view content-by-user when one has draft

Steps to reproduce:

1. Grant necessary permission to allow anonymous users to use Confluence
2. Login as UserA, create a draft (verify the draft exists in the Preferences->Draft tab)
3. Create PageA, with {content-by-user:UserA} in the content (at this point, logged in users are able to view PageA)
4. Log out UserA
5. As an anonymous user, view PageA

The page will throw a "Transaction rolled back" error. Further stack trace can be seen in the logs:

2008-09-25 15:12:38,468 ERROR [http-80-Processor3] [renderer.v2.components.MacroRendererComponent] processMacro Unexpected error formatting macro: content-by-user
– url: /confluence/display/cases/content-by-user | userName: anonymous | action: viewpage | page: 18710556
java.lang.NullPointerException
at com.atlassian.confluence.security.delegate.DraftPermissionsDelegate.isAuthor(DraftPermissionsDelegate.java:49)
at com.atlassian.confluence.security.delegate.DraftPermissionsDelegate.canView(DraftPermissionsDelegate.java:12)
at com.atlassian.confluence.security.Permission$1.checkAgainst(Permission.java:18)
at com.atlassian.confluence.security.DefaultPermissionManager.hasPermission(DefaultPermissionManager.java:29)
at com.atlassian.confluence.security.DefaultPermissionManager.getPermittedEntities(DefaultPermissionManager.java:52)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:296)
at org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:177)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:144)
at com.atlassian.spring.interceptors.SpringProfilingInterceptor.invoke(SpringProfilingInterceptor.java:20)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:166)
at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:107)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:166)
at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:204)
at $Proxy17.getPermittedEntities(Unknown Source)
at com.atlassian.confluence.renderer.radeox.macros.ContentByUserMacro.fetchContent(ContentByUserMacro.java:75)
at com.atlassian.confluence.renderer.radeox.macros.ContentByUserMacro.getHtml(ContentByUserMacro.java:46)
at com.atlassian.confluence.renderer.radeox.macros.AbstractHtmlGeneratingMacro.execute(AbstractHtmlGeneratingMacro.java:42)
at com.atlassian.renderer.macro.RadeoxCompatibilityMacro.execute(RadeoxCompatibilityMacro.java:149)
at com.atlassian.confluence.renderer.v2.macros.RadeoxCompatibilityMacro.execute(RadeoxCompatibilityMacro.java:27)
at com.atlassian.renderer.v2.macro.ResourceAwareMacroDecorator.execute(ResourceAwareMacroDecorator.java:45)
at com.atlassian.renderer.v2.components.MacroRendererComponent.executeMacro(MacroRendererComponent.java:297)
at com.atlassian.renderer.v2.components.MacroRendererComponent.processMacro(MacroRendererComponent.java:255)
at com.atlassian.renderer.v2.components.MacroRendererComponent.makeMacro(MacroRendererComponent.java:151)
at com.atlassian.renderer.v2.components.WikiContentRendererHandler.handleMacro(WikiContentRendererHandler.java:18)
at com.atlassian.renderer.v2.WikiMarkupParser.makeMacro(WikiMarkupParser.java:126)
at com.atlassian.renderer.v2.WikiMarkupParser.makeMacro(WikiMarkupParser.java:114)
at com.atlassian.renderer.v2.WikiMarkupParser.handlePotentialMacro(WikiMarkupParser.java:99)
at com.atlassian.renderer.v2.WikiMarkupParser.parse(WikiMarkupParser.java:60)
at com.atlassian.renderer.v2.components.MacroRendererComponent.render(MacroRendererComponent.java:47)
at com.atlassian.renderer.v2.V2Renderer.render(V2Renderer.java:53)
at com.atlassian.renderer.v2.plugin.PluggableV2Renderer.render(PluggableV2Renderer.java:30)
at com.atlassian.renderer.v2.V2RendererFacade.convertWikiToXHtml(V2RendererFacade.java:57)
at sun.reflect.GeneratedMethodAccessor264.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
...

This bug differs from CONF-9870 as this only affects anonymous users.