Deleting the last key under a dotted key in an inline table produces invalid TOML #662

d = tomlkit.parse('t = {a="", b.c=1, d=1}\n'); del d["t"]["b"]["c"]; tomlkit.dumps(d) returns 't = {a="", , d=1}\n'.
tomllib.loads rejects that output ("Invalid initial character for a key part"). Expected valid TOML that still holds b as an empty table, e.g. t = {a="", b = {}, d=1}.
If b.c is the last key you get a trailing comma ({a = 1, }), if it is the first a leading one ({, a = 1}), and if it is the only key the output is {} and b is gone.