Print `last_error.instruction` in `xor caught an error` message

[folex]

ATM, if you have a lot of errors, it looks like this

xor caught an error: value '[]' does not contain element for idx = '0'
call failed with an error `value '[]' does not contain element for idx = '0'`, peerId `12D3KooWSD5PToNiLQwKDXsu8JSysCwUt8BVUJEqCHcDe7P5h45e`
xor caught an error: value '[]' does not contain element for idx = '0'
call failed with an error `value '[]' does not contain element for idx = '0'`, peerId `12D3KooWSD5PToNiLQwKDXsu8JSysCwUt8BVUJEqCHcDe7P5h45e`
xor caught an error: value '[]' does not contain element for idx = '0'
call failed with an error `value '[]' does not contain element for idx = '0'`, peerId `12D3KooWSD5PToNiLQwKDXsu8JSysCwUt8BVUJEqCHcDe7P5h45e`
xor caught an error: value '[]' does not contain element for idx = '0'
call failed with an error `value '[]' does not contain element for idx = '0'`, peerId `12D3KooWSD5PToNiLQwKDXsu8JSysCwUt8BVUJEqCHcDe7P5h45e`
xor caught an error: value '[]' does not contain element for idx = '0'
call failed with an error `value '[]' does not contain element for idx = '0'`, peerId `12D3KooWSD5PToNiLQwKDXsu8JSysCwUt8BVUJEqCHcDe7P5h45e`
xor caught an error: value '[]' does not contain element for idx = '0'
call failed with an error `value '[]' does not contain element for idx = '0'`, peerId `12D3KooWSD5PToNiLQwKDXsu8JSysCwUt8BVUJEqCHcDe7P5h45e`
xor caught an error: value '[]' does not contain element for idx = '0'
call failed with an error `value '[]' does not contain element for idx = '0'`, peerId `12D3KooWSD5PToNiLQwKDXsu8JSysCwUt8BVUJEqCHcDe7P5h45e`

It's hard to tell what caused this. I suggest to print more information here. For example, format like this:

xor caught an error: 
\t $last_error.message 
\t on peer $last_error.peer_id
\t failed instruction: $last_error.instruction