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.
bool LoadKeyMetadata(const CTxDestination& pubKey, const CKeyMetadata &metadata);
    bool LoadMinVersion(int nVersion) { AssertLockHeld(cs_wallet); nWalletVersion = nVersion; nWalletMaxVersion = std::max(nWalletMaxVersion, nVersion); return true; }
    void UpdateTimeFirstKey(int64_t nCreateTime);
    
    bool AddCryptedKey(const CPubKey &vchPubKey, const std::vector<unsigned char> &vchCryptedSecret) override;
    
    bool LoadCryptedKey(const CPubKey &vchPubKey, const std::vector<unsigned char> &vchCryptedSecret);
    bool AddCScript(const CScript& redeemScript) override;
    bool LoadCScript(const CScript& redeemScript);
    
    bool AddDestData(const CTxDestination &dest, const std::string &key, const std::string &value);
    
    bool EraseDestData(const CTxDestination &dest, const std::string &key);
    
    bool LoadDestData(const CTxDestination &dest, const std::string &key, const std::string &value);
    
    bool GetDestData(const CTxDestination &dest, const std::string &key, std::string *value) const;
    
    std::vector<std::string> GetDestValues(const std::string& prefix) const;
    
    bool AddWatchOnly(const CScript& dest, int64_t nCreateTime);
    bool RemoveWatchOnly(const CScript &dest) override;
    
    bool LoadWatchOnly(const CScript &dest);
    
    int64_t nRelockTime;
    bool Unlock(const SecureString& strWalletPassphrase);