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.
{
    unsigned int nTimeSmart = wtx.nTimeReceived;
    if (!wtx.hashUnset()) {
        if (mapBlockIndex.count(wtx.hashBlock)) {
            int64_t latestNow = wtx.nTimeReceived;
            int64_t latestEntry = 0;
            
            int64_t latestTolerated = latestNow + 300;
            const TxItems& txOrdered = wtxOrdered;
            for (auto it = txOrdered.rbegin(); it != txOrdered.rend(); ++it) {
                CWalletTx* const pwtx = it->second.first;
                if (pwtx == &wtx) {
                    continue;
                }
                CAccountingEntry* const pacentry = it->second.second;
                int64_t nSmartTime;
                if (pwtx) {
                    nSmartTime = pwtx->nTimeSmart;
                    if (!nSmartTime) {
                        nSmartTime = pwtx->nTimeReceived;
                    }
                } else {
                    nSmartTime = pacentry->nTime;
                }
                if (nSmartTime <= latestTolerated) {
                    latestEntry = nSmartTime;
                    if (nSmartTime > latestNow) {
                        latestNow = nSmartTime;
                    }