The existing logic to drop (actually fail on) 0 sized samples seems no op if
if 2 out of 10 samples are of size 0.
Checked same scenario with MediaMuxer where
1. If input file has 300 samples.
2. Make every 5th sample as an empty byte buffer.
3. Output file is generated without error.
4. Output file has 240 samples.
5. Exoplayer is able to play output file (blurry).
The new change is in line with MediaMuxer behaviour.
PiperOrigin-RevId: 528798046
d5fc9e9627