always_use_return bug with if statement

[edward-bestx]

The following code snippet shows a bug when always_use_return is enabled:

module ExampleModule

global switch = false

function example()
    if switch
        1
    end
end

function example2()
    1
end

end

The second function will add a return statement, the first will not. This is despite the fact that the first function returns either 1 or nothing, depending on the value of switch.