[Bug]: Send Amount disappears on Edit Send tx to a Contract

[seaona]

Describe the bug

Problem: when I edit a Send tx to a Contract, if I delete the Amount and I click Next I see that no amount appears on the tx info, instead of showing a 0. It disappears the token name and it's displayed as a Contract Interaction instead of a simple Send

amount-disappear-onedit.mp4

Steps to reproduce

1. Click Send
2. Introduce Contract recipient. I.e. 0x48f874C1Ea87981F71E6D615D317F90c57Ccf448 on Rinkeby
3. Introduce amount and click Next
4. Click Edit Tx
5. Empty Amount value
6. Click Next
7. Check no 0 appears on tx info

Error messages or log output

No response

Version

10.18.0

Build type

No response

Browser

Chrome

Operating system

Linux

Hardware wallet

No response

Additional context

No response