Issue description
Simple issue, but apparently pressing U when you have a storage container open will automatically empty it even though the cursor isn't hovering over empty contents. I do not recall this being an option pre-0.8 as I remember you had to select it to actually empty it.
Reproduction steps
Select any storage container
Press U
Contents now gone
Game version and build number
v0.8.1 (b549)
Operating system
Windows