Since /buffer can except any kind of argument since a buffer can be named just about anything.
However, if the given buffer name can't be found, it should still return an error, making it easier to spot typos in commands.

Related log:
+++verbose+++
<semeion> i was typing /buffer move 48 but for mistake i typed /buffer mode 48 
<semeion> and that don´t send me error msg
---verbose---

In this example, if the user doesn't have a buffer named 'mode', it should've given an error like:
-=- Error: buffer not found or incorrect buffer argument