[Transaction builder]There is no error if the wrong JSON file is uploaded

[liliya-soroka]

Description

There is no error if the wrong JSON file is uploaded

Environment

• Browser: Chrome
• Wallet: MetaMask
• Safe: any
• Environment: prod

Steps to reproduce

1. Go to Transaction Builder
2. Upload wrong JSON file ( as an example the JSON file with the safe address-book)
   Current result: Nothing happens on UI

Expected result

Make sure that the user is informed that the JSON file is wrong

Obtained result

Screenshots