Patch a bug in the fasta and fastq readers

Former-commit-id: 4998f157a90a6b077124d87d4a5cde0dd075d1ce

pkg/obiformats/fastaseq_read.go

@@ -176,6 +176,7 @@ func ParseFastaChunk(source string, ch FastxChunk) *obiiter.BioSequenceBatch {
 		case 1:
 			if is_sep {
 				// No identifier -> ERROR
+				log.Errorf("%s : sequence entry does not have an identifier", source)
 				return nil
 			} else {
 				// Beginning of identifier
@@ -188,6 +189,11 @@ func ParseFastaChunk(source string, ch FastxChunk) *obiiter.BioSequenceBatch {
 				identifier = string(ch.Bytes[start:i])
 				state = 3
 			}
+			if is_end_of_line {
+				// Definition empty
+				definition = ""
+				state = 5
+			}
 		case 3:
 			if is_end_of_line {
 				// Definition empty