Generated features may be generated at bedrock level

[Taschenmogul]

When generating a flat world I saw that Project Zulu's labyrinths would penetrate bedrock, leaving behind the upper part of the staircase which lead directly into the void, without any bedrock left for protection.
I consider this a very minor bug but I wanted to point it out nonetheless as I guess this is an indicator for a missing conditional statement that makes sure that generated terrain features do not try to generate below (or above?) allowed world height.

PS: Refering to Project Zulu version 1.3F

[soultek101]

Thank you very much Taschenmogul for your feedback. I'll definitely have a look at this issue and your suggestion is on the dot.