Panicking error to unimplemented (SlowMist N8)

[clostao]

Description

SlowMist during its audit reported:

If EVM calls make_free_balance_be , the node crashes.

fn make_free_balance_be(
  _who: &T::AccountId,
  _balance: Self::Balance,
) -> SignedImbalance<Self::Balance, Self::PositiveImbalance> {
  panic!("make_free_balance_be is not allowed in this pallet")
}

Response:

Panic call has been removed and implemented a mock function as well as for the rest of this trait. The reason why this trait is mocked is in this issue

Types of changes

What types of changes does your code introduce?

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)