mempool block and time estimation above current max mempool rate

[blackdimund]

Describe the bug

on the /mempool-summary webui page, the sat/byte are currently (this exact moment) only 1 or 2 sat/byte. when you click on the estimated block depth of 1 or 2 sat/byte, it shows the estimated block depth of ~1 and est confirm time ~10min. You can even click on the other sat/byte and it shows the same estimations. So far this is all working correctly. However, if you refresh the page, and try starting off with a sat/byte that is not currently in the mempool, the estimations show nothing. It might be nice to just have the highest possible sat/byte in the mempool and use that data for any sat/byte value that is higher that the user tries to give.

Environment (please complete the following information):

• Bitcoin Core / Node Version 22.0.0
• NodeJS Version 16.13.2
• Browser firefox
• Code Version / Commit 581ad52
• Installation Method npm

Configuration file content

Please include the content from the following files. BE SURE TO MODIFY YOUR CREDENTIALS BEFORE SUBMITTING!!!

• bitcoin.conf server=1 txindex=1 rpcuser=wen_100k rpcpassword=wen_100k rpcallowip=192.168.1.0/24 rpcbind=0.0.0.0

• Your btc-rpc-explorer environment configuration BTCEXP_HOST=0.0.0.0 BTCEXP_BITCOIND_USER=wen100k BTCEXP_BITCOIND_PASS=wen100k Options: electrumx BTCEXP_ADDRESS_API=electrumx BTCEXP_ELECTRUM_SERVERS=tcp://127.0.0.1:50001 BTCEXP_SLOW_DEVICE_MODE=false BTCEXP_BASIC_AUTH_PASSWORK=wouldntyouliketoknow

To Reproduce

Steps to reproduce the behavior: 1 - https://bitcoinexplorer.org/mempool-summary 2 - click on fee rate higher than current max fee rate

Screenshots or Log Output