Spawn Fixer
This is a luanti mod to fix any broken spawns you might have.
I made it after I found much of the time I messed around with luamap, I would spawn in a hill at 0,0,0 instead of at ground level.
It provides a chat command fix_spawn
that looks for any air nodes in a radius of 100 blocks, and if it finds any, it teleports you to it.