There is an assert in `CWalletTx::RelayWalletTransaction` that gets hit.  All other code paths check `fBroadcastTransactions` before getting to `CWallet::ResendWalletTransactionsBefore` except the rpc call `resendwalletransactions`.

It's an easy fix, but we just need to decide whether to throw an error or return an empty array of rebroadcasted transaction ids.

Should be fixed for 0.15.
{
    
    CKey key;                      
    CExtKey masterKey;             
    CExtKey accountKey;            
    CExtKey chainChildKey;         
    CExtKey childKey;              
    
    if (!GetKey(hdChain.masterKeyID, key))
        throw std::runtime_error(std::string(__func__) + ": Master key not found");