Filter null parents

[jmelot]

Closes #475 - filters out parents with null names

Also make calculation of current year more conservative in light of #359

[github-actions[bot]]

No need for rebasing :+1: behind_count is 0 ahead_count is 2

[github-actions[bot]]

☂️ Python Coverage

current status: ✅

Overall Coverage

Lines	Covered	Coverage	Threshold	Status
637	425	67%	0%	🟢

New Files

No new covered files...

Modified Files

File	Coverage	Status
web/scripts/retrieve_data.py	61%	🟢
TOTAL	61%	🟢

updated for commit: e3354c0 by action🐍

[github-actions[bot]]

JavaScript Coverage

Summary

Lines	Statements	Branches	Functions
	68.98% (456/661)	56.31% (232/412)	70.55% (139/197)

Modified Files • (68%)

File	% Stmts	% Branch	% Funcs	% Lines	Uncovered Line #s
All files	68.98	56.31	70.55	68.84
static_data	85.45	91.3	84	84.31
data.js	100	100	100	100