Panic below PDBParserInstance::new if platform does not have a default calling convention

[sentry]

Sentry Issue: BINARYNINJA-8T

STATUS_FATAL_APP_EXIT / 0x7ff74089fab6: Fatal Error: STATUS_FATAL_APP_EXIT / 0x7ff74089fab6
  File "crashpad_client_win.cc", line 230, in crashpad::`anonymous namespace'::HandleAbortSignal
  File "ehhelpers.cpp", line 125, in __processing_throw
  File "throw.cpp", line 79, in _CxxThrowException
  File "seh.rs", line 366, in panic_unwind::imp::throw_exception
  File "seh.rs", line 302, in panic_unwind::imp::panic
...
(25 additional frame(s) were not displayed)

@bdash says:

It looks like a similar crash will occur if the view has no platform. These should probably return Err like the Cannot parse to view with no architecture case already does.