Patch the empty batch bug

Former-commit-id: fcee04b58f2c4a0bf2c27792f991391c0b6ce78e

pkg/obiformats/fastseq_write_fasta.go

@@ -69,6 +69,7 @@ func WriteFasta(iterator obiiter.IBioSequence,
 	options ...WithOption) (obiiter.IBioSequence, error) {
 	opt := MakeOptions(options)
 
+	iterator = iterator.Rebatch(10000)
 	file, _ = goutils.CompressStream(file, opt.CompressedFile(), opt.CloseFile())
 
 	newIter := obiiter.MakeIBioSequence()

pkg/obiformats/fastseq_write_fastq.go

@@ -56,6 +56,9 @@ type FileChunck struct {
 func WriteFastq(iterator obiiter.IBioSequence,
 	file io.WriteCloser,
 	options ...WithOption) (obiiter.IBioSequence, error) {
+
+	iterator = iterator.Rebatch(10000)
+
 	opt := MakeOptions(options)
 
 	file, _ = goutils.CompressStream(file, opt.CompressedFile(), opt.CloseFile())

pkg/obiformats/universal_write.go

@@ -14,8 +14,6 @@ func WriteSequence(iterator obiiter.IBioSequence,
 	file io.WriteCloser,
 	options ...WithOption) (obiiter.IBioSequence, error) {
 
-	iterator = iterator.Rebatch(1000)
-
 	ok := iterator.Next()
 
 	if ok {