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

[Erik Joelsson]

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 look, 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.

-------------

Commit messages:
 - Handle deleted and renamed files without error

Changes: https://git.openjdk.java.net/cr/pull/14/files
 Webrev: https://webrevs.openjdk.java.net/?repo=cr&pr=14&range=00
  Issue: https://bugs.openjdk.java.net/browse/SKARA-988
  Stats: 10 lines in 1 file changed: 2 ins; 6 del; 2 mod
  Patch: https://git.openjdk.java.net/cr/pull/14.diff
  Fetch: git fetch https://git.openjdk.java.net/cr pull/14/head:pull/14

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