fix: LedgerEntryNotExist unittest failure (#1564)

src/rpc/handlers/LedgerEntry.cpp

@@ -24,6 +24,7 @@
 #include "rpc/RPCHelpers.hpp"
 #include "rpc/common/Types.hpp"
 #include "util/AccountUtils.hpp"
+#include "util/Assert.hpp"
 
 #include <boost/json/conversion.hpp>
 #include <boost/json/object.hpp>
@@ -33,6 +34,7 @@
 #include <xrpl/basics/strHex.h>
 #include <xrpl/json/json_value.h>
 #include <xrpl/protocol/AccountID.h>
+#include <xrpl/protocol/ErrorCodes.h>
 #include <xrpl/protocol/Indexes.h>
 #include <xrpl/protocol/Issue.h>
 #include <xrpl/protocol/LedgerFormats.h>
@@ -153,6 +155,7 @@ LedgerEntryHandler::process(LedgerEntryHandler::Input input, Context const& ctx)
 
     // check ledger exists
     auto const range = sharedPtrBackend_->fetchLedgerRange();
+    ASSERT(range.has_value(), "Ledger range must be available");
     auto const lgrInfoOrStatus = getLedgerHeaderFromHashOrSeq(
         *sharedPtrBackend_, ctx.yield, input.ledgerHash, input.ledgerIndex, range->maxSequence
     );