Remove the check in loadInventoryPage to make TRA_snapshot_state work more correctly (#8542)

Co-authored-by: Alexander Zhdanov <alexander.zhdanov@red-soft.ru>

Author: Zhdanov0

src/jrd/tpc.cpp

@@ -311,12 +311,6 @@ void TipCache::loadInventoryPages(thread_db* tdbb, GlobalTpcHeader* header)
 	header->oldest_transaction.store(hdr_oldest_transaction, std::memory_order_relaxed);
 	header->latest_attachment_id.store(hdr_attachment_id, std::memory_order_relaxed);
 
-	// Check if TIP has any interesting transactions.
-	// At database creation time, it doesn't and the code below breaks
-	// if there isn't a single one transaction to care about.
-	if (hdr_oldest_transaction >= hdr_next_transaction)
-		return;
-
 	// Round down the oldest to a multiple of four, which puts the
 	// transaction in temporary buffer on a byte boundary
 	const TraNumber base = hdr_oldest_transaction & ~TRA_MASK;