"No newline at end of file" notes are formatted improperly in the diff panel

[ktam069]

Steps to reproduce:

1. Start application and log in / continue without log in.
2. Open a local or remote repository.
3. Modify the end of a file so that you get "No newline at end of file" in the diff panel.
4. Observe that the line number is duplicated, and the +/- column shows a '<' (or '=') symbol instead. The new line note also spans more than one line.

Actual behaviour:

Expected behaviour:
The new line note should either be removed, or formatted on one line such that the line number does not get duplicated.

Suggestions:
There is currently already a check for the new line note (checking for line.origin()!=62 in git.ts), but this does not seem to work consistently, so you may just need to add a few more checks for other variations of the line.

[0608jennylee]

approve