Sending more than you have gives wrong error message

When sending a path payment you can enter an amount that is higher than you actually have. The resulting error message is that "no path can be created". The error should be : "you're trying to send more than you have ".

No source file, test, or entry point is named. Reproduce a path payment where the requested amount exceeds the available balance, then trace the resulting “no path can be created” error to identify the relevant error handling. Done means this case reports that the sender is trying to send more than they have, with regression coverage.

Written by the indexing model from the issue text.