check if fileActions is null before accessing the property onConfirmClose

[rady-ben]

This change is 

[ancientTexts-net]

---

src/components/application-bar/RepositoryMenu.js, line 48 at r1 (raw file):

      }
    }
  },[actions.close, file, fileActions?.onConfirmClose]);

NOTE: I think this was causing an error in the styleguidist. Fixed. 👍

[ancientTexts-net]

Reviewed all commit messages.
Reviewable status: 0 of 1 files reviewed, 1 unresolved discussion (waiting on @rady-ben)

[jincypjose]

Reviewed 1 of 1 files at r1, all commit messages.
Reviewable status: complete! all files reviewed, all discussions resolved (waiting on @rady-ben)

[ancientTexts-net]