Improve atomic coverage calculation

[aozalevsky]

The function:

IHMValidation/ihm_validation/mmcif_io.py

Lines 931 to 946 in 39a461a

	def get_atomic_coverage(self) -> str:
	"""Measure amount of atomic residues"""
	for _ in self.system.orphan_representations:
	if self.check_sphere() == 1:
	flex = sum([(x.asym_unit.seq_id_range[1]) -
	(x.asym_unit.seq_id_range[0])+1 for x in _ if not x.rigid])
	rigid = sum([(x.asym_unit.seq_id_range[1]) -
	(x.asym_unit.seq_id_range[0])+1 for x in _ if x.rigid])
	if rigid > 0 or flex > 0:
	percentage = str(round(rigid/(rigid+flex)*100))+'%'
	else:
	percentage = '0%'
	else:
	percentage = '100%'
	return percentage

requires improved logic and description.