Error when query or target is the empty string and task='path'

[RubenBSB]

Description
When using edlib.align with an empty query and task='path', the cigar is 'None'.

To Reproduce

result = edlib.align("", "abc", task="path")
edlib.getNiceAlignment(result, "", "abc")

This raises the following error :

Exception: The object alignResult contains an empty CIGAR string. Users must run align() with task='path'. Please check the input alignResult

Expected behavior
In my opinion, the cigar should indicate 3 deletions from the target in this case :

cigar = 3D

Environment

• Python 3.9.6
• edlib version 1.3.9