port rss fix from trunk, for creating dbs

git-svn-id: svn://10.0.0.236/branches/AVIARY_1_0_20040515_BRANCH@158944 18797224-902f-48f8-a5cc-f745e15eee43

mozilla/mailnews/db/msgdb/src/nsMailDatabase.cpp

@@ -121,7 +121,7 @@ NS_IMETHODIMP nsMailDatabase::Open(nsIFileSpec *aFolderName, PRBool create, PRBo
   }
   
   // if the old summary doesn't exist, we're creating a new one.
-  if (!summarySpec.Exists() && create)
+  if ((!summarySpec.Exists() || !summarySpec.GetFileSize()) && create)
     newFile = PR_TRUE;
   
   mailDB = new nsMailDatabase();