Team not found response when using /welcomebot preview [team-name] [user-name]

[DHaussermann]

@jfrerich End to End testing for this has now completed.

When using /welcomebot preview [team-name] [user-name] the help says preview the welcome message for the given team name. The current user's username will be used to render the template.

This command does not work when passing in a username. You get an error that the team was not found.
The command will work when passing in only a team

[DHaussermann]

@aaronrothschild just a heads up as this came up in our discussion today. We held off the welcome bot release for this issue here.