I'm trying to use Entrez (through Biopython) to download the sequence of a TMV replicase gene.

I have the following code: 
```python
# Lookup ID
search = Entrez.esearch(db='gene', term='Tobacco mosaic virus[Orgn] AND replicase')
read = Entrez.read(search)
idlist = read["IdList"]

# Fetch sequence
search = Entrez.efetch(db='gene', id=idlist[0], retmode='text', rettype='gb')
read = SeqIO.read(search, "genbank")
tmv_replicase = read.seq
```

But when I run it it throws the exception on the `SeqIO.read` line: `ValueError: No records found in handle`.

The IDs provided in idlist are: `['1494081', '1494082']`.