Add a shim for object:getyaw returning nan, this should be fixed correctly eventually

mods/mobs/api.lua

@@ -150,13 +150,24 @@ function mobs:register_mob(name, def)
          end,
 	 set_velocity = function(self, v)
             v = (v or 0)
+
             if def.drawtype
             and def.drawtype == "side" then
                self.rotate = math.rad(90)
             end
-			   local yaw = self.object:getyaw() + self.rotate
+
+            local tmpyaw = self.object:getyaw()
+            local yaw = self.rotate;
+
+            if tmpyaw ~= nan then
+               yaw = yaw + tmpyaw
+            else
+               minetest.log("object:getyaw() nan shim used")
+            end
+
             local x = math.sin(yaw) * -v
             local z = math.cos(yaw) * v
+
             self.object:setvelocity({x = x, y = self.object:getvelocity().y, z = z})
          end,
 	 get_velocity = function(self)
@@ -402,7 +413,7 @@ function mobs:register_mob(name, def)
                   local pos = self.object:getpos()
                   pos.y = (pos.y + self.collisionbox[2]) - 0.2
                   local nod = minetest.get_node(pos)
-					    --print ("standing on:", nod.name, pos.y)
+                  --print("standing on:", nod.name, pos.y)
                   if not nod
                      or not minetest.registered_nodes[nod.name]
                   or minetest.registered_nodes[nod.name].walkable == false then
@@ -416,7 +427,7 @@ function mobs:register_mob(name, def)
                            y = pos.y,
                            z = pos.z + self.direction.z
                      })
-					       --print ("in front:", nod.name, pos.y)
+                     --print("in front:", nod.name, pos.y)
                      if nod and nod.name and
                         (nod.name ~= "air"
                          or self.walk_chance == 0) then
@@ -781,7 +792,7 @@ function mobs:register_mob(name, def)
 
                -- water swimmers cannot move out of water
                if self.fly and self.fly_in == "default:water_source" and not lp then
-			 print ("out of water")
+                  -- print("out of water")
                   self.set_velocity(self, 0)
                   self.state = "flop" -- change to undefined state so nothing more happens
                   self:set_animation("stand")
@@ -902,10 +913,7 @@ function mobs:register_mob(name, def)
                end
                -- end of exploding mobs
 
-		   elseif self.state == "attack"
-		      and self.attack_type == "dogfight" then
-		      if not self.attack.player or not self.attack.player:getpos() then
-			 print("stop attacking")
+               -- print("stop attacking")
                self.state = "stand"
                self:set_animation("stand")
                return
@@ -1075,9 +1083,9 @@ function mobs:register_mob(name, def)
                   obj:setvelocity(vec)
                end
                end
-		end,
+end,
 
-	 on_activate = function(self, staticdata, dtime_s)
+on_activate = function(self, staticdata, dtime_s)
 
    if self.type == "monster"
    and peaceful_only then
@@ -1162,9 +1170,9 @@ function mobs:register_mob(name, def)
       self:on_spawn()
    end
 
-		       end,
+end,
 
-	 get_staticdata = function(self)
+get_staticdata = function(self)
 
    -- remove mob when out of range unless tamed
    if mobs.remove == true and self.remove_ok and not self.tamed then
@@ -1185,9 +1193,9 @@ function mobs:register_mob(name, def)
    end
    -- print('===== '..self.name..'\n'.. dump(tmp)..'\n=====\n')
    return minetest.serialize(tmp)
-			  end,
+end,
 
-	 on_punch = function(self, hitter, tflp, tool_capabilities, dir)
+on_punch = function(self, hitter, tflp, tool_capabilities, dir)
    -- weapon wear
    local weapon = hitter:get_wielded_item()
    if weapon:get_definition().tool_capabilities ~= nil then
@@ -1259,8 +1267,8 @@ function mobs:register_mob(name, def)
          end
       end
    end
-		    end,
-      })
+end,
+})
 end
 
 mobs.spawning_mobs = {}