504 Gateway Time-out when trying to access Uploaded Model page 
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## Details
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I recently uploaded a model available at `https://huggingface.co/paulowoicho/t5-podcast-summarisation`. I made a few changes to the model card and reuploaded. Now, the model's page does not load at all. Instead, it shows a 504 Gateway Time-out error.

![image](https://user-images.githubusercontent.com/28223751/90789131-71616400-e2fe-11ea-928c-070da9ffb449.png)

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cc @julien-c I'm also experiencing this.<|||||>Yes, the reason is that your model card's metadata is not valid YAML.

I had fixed it on S3 but you overrode it with the previous version – this is a known limitation of our model card system right now and why:
- we recommend submitting the model cards to this git repo for now
- we are working on a way better system to be released in the coming weeks/months

(cc @sgugger @JetRunner and others for context ^^)

I've fixed our website to handle those model pages by displaying an error notice<|||||>https://huggingface.co/paulowoicho/t5-podcast-summarisation