Local runs fail with -bat identity -bkey max

[chasemc]

Not going to PR because I haven't looked into how all the code interacts, but

cblaster search -m local -db... -bat identity -bkey max

fails, and it seems to be caused when there's no hits.

python3.9/site-packages/cblaster/formatters.py", line 64, in get_cell_values
    result[index] = key(values)
ValueError: max() arg is an empty sequence

Relevant code:

cblaster/cblaster/formatters.py

Lines 58 to 64 in 8b6d97e

	values = [
	getattr(hit, attr) if attr else hit
	for subject in subjects
	for hit in subject.hits
	if hit.query == query
	]
	result[index] = key(values)

[gamcil]

Fixed with #77