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.
std::set<int64_t> setExternalKeyPool;
    int64_t m_max_keypool_index;
    int64_t nTimeFirstKey;
    /**
     * Private version of AddWatchOnly method which does not accept a
     * timestamp, and which will reset the wallet's nTimeFirstKey value to 1 if
     * the watch key did not previously have a timestamp associated with it.
     * Because this is an inherited virtual method, it is accessible despite
     * being marked private, but it is marked private anyway to encourage use
     * of the other AddWatchOnly which accepts a timestamp and sets
     * nTimeFirstKey more intelligently for more efficient rescans.
     */
    bool AddWatchOnly(const CScript& dest) override;
    std::unique_ptr<CWalletDBWrapper> dbw;
public:
    /*
     * Main wallet lock.
     * This lock protects all the fields added by CWallet.
     */
    mutable CCriticalSection cs_wallet;
    /** Get database handle used by this wallet. Ideally this function would
     * not be necessary.
     */
    CWalletDBWrapper& GetDBHandle()
    {
        return *dbw;
    }
    /** Get a name for this wallet for logging/debugging purposes.
     */
    std::string GetName() const