Invoice Dashboard displays incorrect amount when token is unknown and has less than 18 decimals

[MantisClone]

Problem(s)

Invoice Dashboard displays incorrect amount when token is unknown and has less than 18 decimals

PDF Fails to download when token is unknown - even when the invoice is created by Invoicing (Not Checkout)

Proposed Solution

• Fix the Invoice Dashboard to handle all the currencies supported by the Create Request Form
• Fix the Invoice Template to handle all the same currencies supported by the Payment Widget
• Fix: When a token is unknown (meaning that the number of decimals is unknown), the Invoice Dashboard should NOT display a number. Rather it should say "Unknown Token". It's better to display incomplete data than incorrect data.
• Fix the PDF Download even if token is unknown