Don't exit app when GetRepoPaths call fails during startup (#3779)

- **PR Description**
Fixes #3740 

As explained in the issue, 7a67096 moved some code around that caused a
call to `GetRepoPaths` to occur before `setupApp`, which usually handles
the scenario where we are not in a git directory. `GetRepoPaths` returns
an error if the path isn't a git repository, which caused the app to
exit before we reached `setupApp`.

When starting up lazygit, we ignore (and log) the error returned by
`GetRepoPaths`, and continue instead of exiting early. This allows us to
reach the step where we follow the user's `notARepository` config entry.

pkg/app/app.go

@@ -118,11 +118,11 @@ func NewApp(config config.AppConfigurer, test integrationTypes.IntegrationTest,
 		return app, err
 	}
 
-	// If we're not in a repo, repoPaths will be nil. The error is moot for us
+	// If we're not in a repo, GetRepoPaths will return an error. The error is moot for us
 	// at this stage, since we'll try to init a new repo in setupRepo(), below
 	repoPaths, err := git_commands.GetRepoPaths(app.OSCommand.Cmd, gitVersion)
 	if err != nil {
-		return app, err
+		common.Log.Infof("Error getting repo paths: %v", err)
 	}
 
 	showRecentRepos, err := app.setupRepo(repoPaths)