::get_output_keys  but key does not exist 
```
2019-03-12 08:28:26,916 [E,OM,CurrentBlockchainStatus.cpp:xmreg::CurrentBlockchainStatus::get_output_keys(const uint64_t&, const std::vector<long unsigned int>&, std::vector<cryptonote::output_data_t>&)::<lambda(const auto:20&, const auto:21&, auto:22&)> [with auto:20 = long unsigned int; auto:21 = std::vector<long unsigned int>; auto:22 = std::vector<cryptonote::output_data_t>]:365] get_output_keys: Attempting to get output pubkey by global index (amount 0, index 1057798, count 1049599), but key does not exist (current height 276082)                                                                                   
terminate called after throwing an instance of 'std::out_of_range'
  what():  vector::_M_range_check: __n (which is 5) >= this->size() (which is 5)

Thread 9 "openmonero" received signal SIGABRT, Aborted.
[Switching to Thread 0x7ffc9effd700 (LWP 15472)]
0x00007ffff70a6d7f in raise () from /usr/lib/libc.so.6
(gdb) where
#0  0x00007ffff70a6d7f in raise () from /usr/lib/libc.so.6
#1  0x00007ffff7091672 in abort () from /usr/lib/libc.so.6
#2  0x00007ffff745d58e in __gnu_cxx::__verbose_terminate_handler ()
    at /build/gcc/src/gcc/libstdc++-v3/libsupc++/vterminate.cc:95
#3  0x00007ffff7463dfa in __cxxabiv1::__terminate (handler=<optimized out>)
    at /build/gcc/src/gcc/libstdc++-v3/libsupc++/eh_terminate.cc:47
#4  0x00007ffff7463e57 in std::terminate () at /build/gcc/src/gcc/libstdc++-v3/libsupc++/eh_terminate.cc:57
#5  0x00007ffff74640ac in __cxxabiv1::__cxa_throw (obj=<optimized out>,
    tinfo=0x5555562df518 <typeinfo for std::out_of_range@@GLIBCXX_3.4>,
    dest=0x7ffff7479ba0 <std::out_of_range::~out_of_range()>)
    at /build/gcc/src/gcc/libstdc++-v3/libsupc++/eh_throw.cc:95
#6  0x0000555555bf4198 in __cxa_throw ()
#7  0x00007ffff745f7aa in std::__throw_out_of_range_fmt (__fmt=<optimized out>) from /usr/lib/libstdc++.so.6
#8  0x0000555555deec6d in std::vector<cryptonote::output_data_t, std::allocator<cryptonote::output_data_t> >::_M_range_check (this=0x7ffc9effa440, __n=5) at /usr/include/c++/8.2.1/bits/stl_vector.h:960      
#9  0x0000555555ded0e9 in std::vector<cryptonote::output_data_t, std::allocator<cryptonote::output_data_t> >::at (this=0x7ffc9effa440, __n=5) at /usr/include/c++/8.2.1/bits/stl_vector.h:981                  
#10 0x0000555555de86b8 in xmreg::Input::identify (this=0x7ffc844323e0, tx=..., tx_pub_key=...,
    additional_tx_pub_keys=std::vector of length 0, capacity 0)
    at /home/mwo2/openmonero/src/xmregcore/src/UniversalIdentifier.cpp:323
#11 0x0000555555d0fb85 in xmreg::ModularIdentifier<xmreg::Output, xmreg::Input>::identify (
    this=0x7ffc9effa8f0) at /home/mwo2/openmonero/src/xmregcore/src/UniversalIdentifier.hpp:325
#12 0x0000555555d0c548 in xmreg::TxSearch::find_txs_in_mempool (this=0x7ffc98009180,
    mempool_txs=std::vector of length 21673, capacity 21673 = {...}, j_transactions=0x7ffc9effaf10)
    at /home/mwo2/openmonero/src/TxSearch.cpp:776 
#13 0x0000555555c36660 in xmreg::CurrentBlockchainStatus::find_txs_in_mempool (this=0x55555643aa10,
    address_str="56NWFo4LtKfJ96XQZDKpm3jNAcQ4RHkxYREUvFRPSfoMNmbH3UfmS7DfAkQpkPmuHrfwhZQVVo1JbHToPiKQFnNsRPrgQnD", transactions=...) at /home/mwo2/openmonero/src/CurrentBlockchainStatus.cpp:925
```


It happens because we attempt to scan txpool for our txs, but the blockchain is still syncing. This causes some outputs present in txpool not found in the blockchain. Have to wait till fully synced.