Title: Error messages when hitting undo too often in building screen
Summary: Due to a miscount on my part, I ended up with an asymmetrical building, so of course I had to tear it down using the undo button in the building designer. I clicked the button rapidly and hit it once too often, after everything about the blueprint had already been removed. This got me a few error messages, which can be seen (albeit briefly, I had clicked to get rid of them before I even realized what I was doing) in the attached video.
Steps to reproduce: Design some building, then remove it using the undo button; hit the button once or twice too often. Might also occur if you just hit the undo button when designing a building, period, even without having designed anything to begin with. Not sure.
Versions and mods: No mods, latest release version in Steam at the time of writing, version 0.1.0 (release 114) according to the title screen.
OS: Windows 8 Pro 64 bits (6.2, build 9200)
Processor: Intel® Core™ i5-3450 CPU @ 3.10GHz (4 CPUs), ~3.5GHz
Memory: 8192MB RAM
DirectX-version: DirectX 11
Graphics card: NVIDIA GeForce GTX 660