Logging can trigger a panic in TransactionATRLocation

When we dump the TransactionsConfig to the log we attempt to log the custom ATR location. If there is no custom ATR location then the call .Agent() leads to a panic which leads to logs like

Initializing transactions: CustomATRLocation:%!s(PANIC=String method: runtime error: invalid memory address or nil pointer dereference) ExpirationTime:0s 

I'm not entirely sure why this doesn't crash the entire SDK.