Fixed crash (I still don't understand why new imap folders don't get assigned

an account right away, but only when syncing... Sounds like a bug, so this commit
is more of a workaround...)

svn path=/trunk/kdepim/; revision=305208

folderdiaacltab.cpp

@@ -717,7 +717,7 @@ bool KMail::FolderDiaACLTab::supports( KMFolder* refFolder )
     imapAccount = static_cast<KMFolderImap*>( refFolder->storage() )->account();
   else
     imapAccount = static_cast<KMFolderCachedImap*>( refFolder->storage() )->account();
-  return imapAccount->hasACLSupport(); // support for ACLs (or not tried connecting yet)
+  return imapAccount && imapAccount->hasACLSupport(); // support for ACLs (or not tried connecting yet)
 }
 
 #include "folderdiaacltab.moc"