Unable to upload empty file?

macOS 10.12.6, Python 3.6.2, google-cloud-storage 1.2.0.

It seems that if a file is empty, I cannot upload it:

blob = storage.Blob(dest_filename, bucket, chunk_size=262144)
blob.upload_from_filename(src_filename, content_type=content_type)

Error:

File "storage.py", line 88, in upload_from_file
    blob.upload_from_filename(src_filename, content_type=content_type)
File "app/env/lib/python3.6/site-packages/google/cloud/storage/blob.py", line 934, in upload_from_filename
    size=total_bytes)
File "app/env/lib/python3.6/site-packages/google/cloud/storage/blob.py", line 891, in upload_from_file
    client, file_obj, content_type, size, num_retries)
File "app/env/lib/python3.6/site-packages/google/cloud/storage/blob.py", line 818, in _do_upload
    client, stream, content_type, size, num_retries)
File "app/env/lib/python3.6/site-packages/google/cloud/storage/blob.py", line 771, in _do_resumable_upload
    response = upload.transmit_next_chunk(transport)
File "app/env/lib/python3.6/site-packages/google/resumable_media/requests/upload.py", line 392, in transmit_next_chunk
    method, url, payload, headers = self._prepare_request()
File "app/env/lib/python3.6/site-packages/google/resumable_media/_upload.py", line 531, in _prepare_request
    self._stream, self._chunk_size, self._total_bytes)
File "app/env/lib/python3.6/site-packages/google/resumable_media/_upload.py", line 805, in get_next_chunk
    u'Stream is already exhausted. There is no content remaining.')
ValueError: Stream is already exhausted. There is no content remaining.

When uploading a folder, it'd be ideal if I don't need to check whether a file is empty before uploading. Or am I doing something wrong?

Thanks!