The MLT block will use the site default environment instead of the block default environment.

https://github.com/openscholar/openscholar/issues/5394#issuecomment-38323829

@rbran100 I thought on a different solution: we won't use the block environment but the site wide default environment. When the default environment is not define the user will ge the next error:
![earths sunny interior global education innovation initiative](https://f.cloud.github.com/assets/1222368/2492963/6e09dce2-b26d-11e3-89bf-477d5fb5612c.png)