routing: only set firstHopBlob if we have custom records

routing/pathfind.go

@@ -1007,6 +1007,8 @@ func findPath(g *graphParams, r *RestrictParams, cfg *PathFindingConfig,
 				continue
 			}
 
+			var firstHopBlob fn.Option[tlv.Blob]
+			if r.FirstHopCustomRecords != nil {
 				firstHopTLVs := lnwire.CustomRecords(
 					r.FirstHopCustomRecords,
 				)
@@ -1015,10 +1017,12 @@ func findPath(g *graphParams, r *RestrictParams, cfg *PathFindingConfig,
 					return nil, 0, err
 				}
 
+				firstHopBlob = fn.Some(firstHopData)
+			}
+
 			edge := edgeUnifier.getEdge(
 				netAmountReceived, g.bandwidthHints,
-				partialPath.outboundFee,
-				fn.Some[tlv.Blob](firstHopData),
+				partialPath.outboundFee, firstHopBlob,
 			)
 
 			if edge == nil {