Minecolonies version

Minecolonies v0.4.3

Expected behavior

to build and upgrade without a exception getting thrown and causing minor lagg to client

Actual behaviour throws exception dealing with signs

Steps to reproduce the problem

when making certain buildings and upgrading the town hall and builders hut

exceptioned logged:http: //pastebin.com/4j0KZhSJ

also one of my colonist died and crashed the game
crash report:
crash-2016-09-14_15.36.41-server.txt

Thanks a lot for the report!

It seems the citizen dieing is related to #121