[cr] RFR: 988: Skara webrev is empty if patch has deleted files

[Erik Helin]

On Thu, 22 Apr 2021 21:35:43 GMT, Erik Joelsson <erikj at openjdk.org> wrote:

> If a file in the patch has been deleted this causes a dereference of an undefined value. To fix this I removed the quick return in fetchFileContent so that this function always returns a value.
> 
> While verifying this, I also noted that the deleted file gets a Raw link which results in a 404. I think it should just not print the Raw link so I removed that too.
> 
> If a file has only been renamed, with no other changes, the patch will be an empty string. This upsets the hunk loop, so I added a case for handling this.
> 
> The resulting webrevs from the two reported patches look correct to me with these changes, but I would appreciate some more eyes on this.

@erikj79 I don't follow how removing the fast return is correct? The `fetch` will then result in an `404` which I don't think the rest of the code will handle? I _think_ returning `Promise.resolve([])` (i.e. an empty array wrapped in promise) would be better. `apply` should be able to handle that `lines` is empty, so things "should" just work.

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PR: https://git.openjdk.java.net/cr/pull/14