fix(ghidra): avoid crash if we try to decompile a faulty addr/func
fix(ghidra): avoid crash if we try to decompile a faulty addr/func

This may happen if either something goes wrong during the command or if
the passed addr/func for custom decompilation is simply faulty.

anthraxx/pwndbg,pwndbg/pwndbg,pwndbg/pwndbg,anthraxx/pwndbg,pwndbg/pwndbg,pwndbg/pwndbg,anthraxx/pwndbg,anthraxx/pwndbg