If we detect a missing node in a ledger we're supposed to have full,

re-acquire that ledger to fill the hole.

src/cpp/ripple/NetworkOPs.h

@@ -183,6 +183,7 @@ public:
 	Ledger::ref		getCurrentLedger()						{ return mLedgerMaster->getCurrentLedger(); }
 	Ledger::pointer	getLedgerByHash(const uint256& hash)	{ return mLedgerMaster->getLedgerByHash(hash); }
 	Ledger::pointer	getLedgerBySeq(const uint32 seq);
+	void			missingNodeInLedger(const uint32 seq);
 
 	uint256			getClosedLedgerHash()					{ return mLedgerMaster->getClosedLedger()->getHash(); }