detect_read_strand falls back to "-" strand if context sequence not detected

[didacs]

Hi,

I noticed that detect_read_strand will fall back to "-" strand if editDistance is the same for both fwd and rev context sequence, for example if there are no hits (editDistance = -1). Is this the expected behavior?

pipeline-umi-amplicon/lib/umi_amplicon_tools/extract_umis.py

Lines 173 to 180 in a95d573

	def detect_read_strand(read_5p_seq, upstream_context_fwd, upstream_context_rev):
	result_fwd = edlib.align(upstream_context_fwd, read_5p_seq, mode="HW", k=5)
	result_rev = edlib.align(upstream_context_rev, read_5p_seq, mode="HW", k=5)
	strand = "-"
	if result_fwd["editDistance"] < result_rev["editDistance"]:
	strand = "+"
	return strand

Thank you,
Didac