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.
continue;
            }
        }
        if (nChangePosInOut == -1) reservekey.ReturnKey(); 
        if (sign)
        {
            CTransaction txNewConst(txNew);
            int nIn = 0;
            for (const auto& coin : setCoins)
            {
                const CScript& scriptPubKey = coin.txout.scriptPubKey;
                SignatureData sigdata;
                if (!ProduceSignature(TransactionSignatureCreator(this, &txNewConst, nIn, coin.txout.nValue, SIGHASH_ALL), scriptPubKey, sigdata))
                {
                    strFailReason = _("Signing transaction failed");
                    return false;
                } else {
                    UpdateTransaction(txNew, nIn, sigdata);
                }
                nIn++;
            }
        }
        
        wtxNew.SetTx(MakeTransactionRef(std::move(txNew)));
        
        if (GetTransactionWeight(wtxNew) >= MAX_STANDARD_TX_WEIGHT)
        {
            strFailReason = _("Transaction too large");
            return false;
        }