Don't hide "Show log" button when fetch/pull was not successful

What steps will reproduce the problem?

1. Ensure that you have at least one repository that will trigger an error when attempting to fetch (eg unreachable)
2. Click "fetch" (or other related commands)
3. select - all -

observe that the Show log button will not appear due to errors during fetching; instead, the Retry button will appear.

What is the expected output? What do you see instead?

I miss the Show log button because often I KNOW that some repos are not reachable, so after such a fetch I have to run "Show log" separately. There is no need to hide that button. Instead, Retry could appear if anything went wrong (but in fact that button might be useful too, so no need to hide it after all)

What version of TortoiseGit and Git are you using? On what operating system?

TortoiseGit 2.2.0.0 (C:\Program Files\TortoiseGit\bin) git version 2.11.0.windows.1 (C:\Program Files\Git\bin; C:\Program Files\Git\mingw64; C:\Program Files\Git\mingw64\etc\gitconfig; C:\ProgramData\Git\config)