LldbAdapter::GetTargetArchitecture crashes if SBPlatform::GetTriple returns nullptr

[sentry]

Sentry Issue: BINARYNINJA-BJ

EXCEPTION_ACCESS_VIOLATION_READ / 0x0: Fatal Error: EXCEPTION_ACCESS_VIOLATION_READ / 0x0
  File "xstring", line 415, in std::_Narrow_char_traits<T>::length
  File "xstring", line 2675, in std::basic_string<T>::{ctor}
  File "lldbadapter.cpp", line 1576, in BinaryNinjaDebugger::LldbAdapter::GetTargetArchitecture
  File "lldbadapter.cpp", line 1227, in BinaryNinjaDebugger::LldbAdapter::AddHardwareBreakpoint
  File "future", line 445, in std::_Associated_state<T>::_Delete_this
...
(20 additional frame(s) were not displayed)

@bdash says:

SBPlatform::GetTriple can return nullptr in some situations. It is undefined behavior to construct std::string with a const char* that is nullptr. On Windows it appears to crash.

[bdash]

It looks like there are a number of other LLDB APIs that return const char* that the LldbAdapter code passes directly to the std::string constructor without verifying that they are non-null. I'm not sure under what conditions, if any, these other APIs can return null.