reduced CPU load at floodfill

NetDb.cpp

@@ -704,13 +704,15 @@ namespace data
 			if (!replyMsg)
 			{
 				LogPrint ("Requested ", key, " not found. ", numExcluded, " excluded");
+				std::vector<IdentHash> routers;
+				if (numExcluded > 0)
+				{	
 					std::set<IdentHash> excludedRouters;
 					for (int i = 0; i < numExcluded; i++)
 					{
 						excludedRouters.insert (excluded);
 						excluded += 32;
 					}		
-				std::vector<IdentHash> routers;
 					for (int i = 0; i < 3; i++)
 					{
 						auto floodfill = GetClosestFloodfill (buf, excludedRouters);
@@ -720,6 +722,9 @@ namespace data
 							excludedRouters.insert (floodfill->GetIdentHash ());
 						}	
 					}	
+				}	
+				else
+					routers = GetClosestFloodfills (buf, 3);
 				replyMsg = CreateDatabaseSearchReply (buf, routers);
 			}
 		}