elf analyzer assumes elf is unpacked when running analyzer

[dannyp303]

If you identify and then analyze an elf without unpacking, these lines will throw an error since the children don't exist.

ofrak/ofrak_core/ofrak/core/elf/analyzer.py

Lines 368 to 381 in d8e22a9

	elf_header = await resource.get_only_descendant_as_view(
	ElfHeader, r_filter=ResourceFilter.with_tags(ElfHeader)
	)
	elf_basic_header = await resource.get_only_descendant_as_view(
	ElfBasicHeader, r_filter=ResourceFilter.with_tags(ElfBasicHeader)
	)
	return ProgramAttributes(
	elf_header.get_isa(),
	None,
	elf_basic_header.get_bitwidth(),
	elf_basic_header.get_endianness(),
	None,
	)