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.
{
        SetTx(MakeTransactionRef());
        Init();
    }
    CMerkleTx(CTransactionRef arg)
    {
        SetTx(std::move(arg));
        Init();
    }
    /** Helper conversion operator to allow passing CMerkleTx where CTransaction is expected.
     *  TODO: adapt callers and remove this operator. */
    operator const CTransaction&() const { return *tx; }
    void Init()
    {
        hashBlock = uint256();
        nIndex = -1;
    }
    void SetTx(CTransactionRef arg)
    {
        tx = std::move(arg);
    }
    ADD_SERIALIZE_METHODS;
    template <typename Stream, typename Operation>
    inline void SerializationOp(Stream& s, Operation ser_action) {