#635 Emulator crashes on lua error with memory.registerexec

[Feels Ranger Man]

When using memory.registerexec, if a lua error is thrown within it, FCEUX crashes. Such as the following example that misspells 'memory.readbyte'. Lua will say it cannot find 'memory.readbyre' and crash.

local function test()
    memory.registerexec(0xFF2A,function()
        memory.readbyre(0x100)
    end)
end

while true do
    test()
    emu.frameadvance()
end