[O] beamer_env tag issue with empty headlines

[Prateek Mehta]

Hi,

I have a beamer block setup like below, so that it does not have a headline.

**      :B_block:BMCOL:

   :PROPERTIES:

   :BEAMER_col: 0.64

   :BEAMER_env: block

   :END:

- Some text here

When I export it, the beamer environment tags show up in the pdf. This was not the case a couple of months ago, when the tags didn't appear in the pdf. 

If the the headline is not empty, the tags do not show in the pdf and it works as it used to.

Has there been a recent change that introduced this?

I am using emacs 24.5.1 and org 8.3.1.

Thanks,

Prateek