utf8? characters in the server name cause crash

[tra]

Iritscen tried to start a server and typed Option-; (…) into the server name and it crashed. Here's his stack trace:

Thread 8 Crashed:
0   libsystem_kernel.dylib        	    0x7ff81a72722a __pthread_kill + 10
1   libsystem_pthread.dylib       	    0x7ff81a75ef7b pthread_kill + 263
2   libsystem_c.dylib             	    0x7ff81a6a8ca5 abort + 123
3   libc++abi.dylib               	    0x7ff81a719082 abort_message + 241
4   libc++abi.dylib               	    0x7ff81a70a225 demangling_terminate_handler() + 242
5   libobjc.A.dylib               	    0x7ff81a40702b _objc_terminate() + 104
6   libc++abi.dylib               	    0x7ff81a7184a5 std::__terminate(void (*)()) + 8
7   libc++abi.dylib               	    0x7ff81a71ad05 __cxxabiv1::failed_throw(__cxxabiv1::__cxa_exception*) + 27
8   libc++abi.dylib               	    0x7ff81a71accc __cxa_throw + 116
9   Avara                         	       0x10b0c4851 nlohmann::json_abi_v3_11_2::detail::serializer<nlohmann::json_abi_v3_11_2::basic_json<std::__1::map, std::__1::vector, std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> >, bool, long long, unsigned long long, double, std::__1::allocator, nlohmann::json_abi_v3_11_2::adl_serializer, std::__1::vector<unsigned char, std::__1::allocator<unsigned char> >, void> >::dump_escaped(std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> > const&, bool) + 2625
10  Avara                         	       0x10b0c2699 nlohmann::json_abi_v3_11_2::detail::serializer<nlohmann::json_abi_v3_11_2::basic_json<std::__1::map, std::__1::vector, std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> >, bool, long long, unsigned long long, double, std::__1::allocator, nlohmann::json_abi_v3_11_2::adl_serializer, std::__1::vector<unsigned char, std::__1::allocator<unsigned char> >, void> >::dump(nlohmann::json_abi_v3_11_2::basic_json<std::__1::map, std::__1::vector, std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> >, bool, long long, unsigned long long, double, std::__1::allocator, nlohmann::json_abi_v3_11_2::adl_serializer, std::__1::vector<unsigned char, std::__1::allocator<unsigned char> >, void> const&, bool, bool, unsigned int, unsigned int) + 2969
11  Avara                         	       0x10b0c2066 nlohmann::json_abi_v3_11_2::detail::serializer<nlohmann::json_abi_v3_11_2::basic_json<std::__1::map, std::__1::vector, std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> >, bool, long long, unsigned long long, double, std::__1::allocator, nlohmann::json_abi_v3_11_2::adl_serializer, std::__1::vector<unsigned char, std::__1::allocator<unsigned char> >, void> >::dump(nlohmann::json_abi_v3_11_2::basic_json<std::__1::map, std::__1::vector, std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> >, bool, long long, unsigned long long, double, std::__1::allocator, nlohmann::json_abi_v3_11_2::adl_serializer, std::__1::vector<unsigned char, std::__1::allocator<unsigned char> >, void> const&, bool, bool, unsigned int, unsigned int) + 1382
12  Avara                         	       0x10b09fa86 nlohmann::json_abi_v3_11_2::basic_json<std::__1::map, std::__1::vector, std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> >, bool, long long, unsigned long long, double, std::__1::allocator, nlohmann::json_abi_v3_11_2::adl_serializer, std::__1::vector<unsigned char, std::__1::allocator<unsigned char> >, void>::dump(int, char, bool, nlohmann::json_abi_v3_11_2::detail::error_handler_t) const + 454
13  Avara                         	       0x10b1f6a46 CAvaraAppImpl::TrackerPayload() + 134
14  Avara                         	       0x10b1f64ce TrackerPinger(CAvaraAppImpl*) + 126
15  Avara                         	       0x10b2902f0 decltype(static_cast<void (*>(fp)(static_cast<CAvaraAppImpl*>(fp0))) std::__1::__invoke<void (*)(CAvaraAppImpl*), CAvaraAppImpl*>(void (*&&)(CAvaraAppImpl*), CAvaraAppImpl*&&) + 32
16  Avara                         	       0x10b29027e void std::__1::__thread_execute<std::__1::unique_ptr<std::__1::__thread_struct, std::__1::default_delete<std::__1::__thread_struct> >, void (*)(CAvaraAppImpl*), CAvaraAppImpl*, 2ul>(std::__1::tuple<std::__1::unique_ptr<std::__1::__thread_struct, std::__1::default_delete<std::__1::__thread_struct> >, void (*)(CAvaraAppImpl*), CAvaraAppImpl*>&, std::__1::__tuple_indices<2ul>) + 62
17  Avara                         	       0x10b28fa42 void* std::__1::__thread_proxy<std::__1::tuple<std::__1::unique_ptr<std::__1::__thread_struct, std::__1::default_delete<std::__1::__thread_struct> >, void (*)(CAvaraAppImpl*), CAvaraAppImpl*> >(void*) + 98
18  libsystem_pthread.dylib       	    0x7ff81a75f259 _pthread_start + 125
19  libsystem_pthread.dylib       	    0x7ff81a75ac7b thread_start + 15```