NMI Handling in Bootloader


i use a Little Assembler Program to copy a Bootloader from Flash to RAM and it works fine so far.

The question i'm asking myself: The Program starts automatically at the Reset-Vector in Flash and defines no other Interrupt Service Vector.

For me, thats's OK, because all Interrupts are disabled but what happens if a NMI appears?

For my Controller STM32F103RB, the NMI is only sourced by a so called Clock Security System.

Because i don't use it nothing happens. But what if i change the Controller some day?

Is it good Practice to handle the NMI in such a small Program or is it not neccessary?