You can place torch on the side of the glass.

What ive expected:
When placing torch on the side of glass, it shouldnt happen. You can however place glass on top of the glass block

What happened:
I placed torches on the side of the glass block.

Steps on repeating this:
1. Place glass block down
2. Put torches on the side of the glass block

The first screenshot: what i did is ,i put down 4 glass and placed torches in different position. This is the beta version

The second screenshot: i tried placing torches on the glass but it couldnt, it could only place on top. This is the current release which is 0.15.10