add bug # to the assertion, so people know where to add info if they can reproduce this.

mailnews/base/src/nsMsgMessageDataSource.cpp

@@ -1450,7 +1450,7 @@ nsresult nsMsgMessageDataSource::GetThreadsFirstMessage(nsIMsgThread *thread, ns
 	if(NS_FAILED(rv))
 		return rv;
 
-	NS_ASSERTION(firstHdr,"firstHdr is null");
+	NS_ASSERTION(firstHdr,"firstHdr is null. can you reproduce this?  add info to bug #35567");
 	if (!firstHdr) return NS_ERROR_FAILURE;
 
 	rv = folder->CreateMessageFromMsgDBHdr(firstHdr, message);

mailnews/imap/src/nsImapMailFolder.cpp

@@ -1966,7 +1966,7 @@ NS_IMETHODIMP nsImapMailFolder::CreateMessageFromMsgDBHdr(nsIMsgDBHdr *msgDBHdr,
   nsMsgKey key;
     nsCOMPtr<nsIRDFResource> res;
 
-	NS_ASSERTION(msgDBHdr,"msgDBHdr is null");
+	NS_ASSERTION(msgDBHdr,"msgDBHdr is null.  can you reproduce this?  add info to bug #35567");
   if (!msgDBHdr) return NS_ERROR_NULL_POINTER;
   rv = msgDBHdr->GetMessageKey(&key);