Fix crash with minecart on activator rail

mods/ENTITIES/mcl_minecarts/carts.lua

@@ -67,6 +67,8 @@ local function detach_driver(self)
 		--print("No player object found for "..driver_name)
 	end
 end
+mod.detach_driver = detach_driver
+
 function mod.kill_cart(staticdata, killer)
 	local pos
 	mcl_log("cart #"..staticdata.uuid.." was killed")
@@ -341,11 +343,12 @@ function DEFAULT_CART_DEF:on_step(dtime)
 		end
 	end
 
+
 	if not staticdata.connected_at then
 		do_detached_movement(self, dtime)
-	end
-
+	else
 		mod.update_cart_orientation(self)
+	end
 end
 function DEFAULT_CART_DEF:on_death(killer)
 	kill_cart(self._staticdata, killer)

mods/ENTITIES/mcl_minecarts/carts/minecart.lua

@@ -7,7 +7,7 @@ local mod = mcl_minecarts
 local PASSENGER_ATTACH_POSITION = mod.PASSENGER_ATTACH_POSITION
 
 local function activate_normal_minecart(self)
-	detach_driver(self)
+	mod.detach_driver(self)
 
 	-- Detach passenger
 	if self._passenger then

mods/ENTITIES/mcl_minecarts/movement.lua

@@ -572,6 +572,12 @@ local function do_detached_movement(self, dtime)
 			return
 		end
 	end
+
+	-- Reset pitch if still not attached
+	local rot = self.object:get_rotation()
+	minetest.log(vector.to_string(rot))
+	rot.x = 0
+	self.object:set_rotation(rot)
 end
 
 --return do_movement, do_detatched_movement