SAM TLEN should be 0 when either read is unmapped #373
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this_rid/this_pos will be copied from r_prev(=r_next)'s values when this read is unmapped (i.e., r is NULL). In this case, we can write RNEXT as '=' but should not calculate TLEN from these placeholder values. Similarly when the mate is unmapped (i.e., r_next is NULL). Fixes lh3#365.
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Don't compute
tlenwhen eitherrorr_nextindicates unmapped. Fixes #365.(Compiled, but I have not rigorously tested this.)