[Change] Minor AI tweaks.

scripts/ai/tpl/escort.lua

@@ -85,7 +85,9 @@ end
 --Attack target.
 function e_attack(target)
   if command then
-    ai.pushtask(0, "attack", target)
+    if target ~= nil then
+      ai.pushtask(0, "attack", target)
+    end
   end
 end
 

scripts/ai/tpl/generic.lua

@@ -83,6 +83,11 @@ function attacked(attacker)
     if ai.target() ~= attacker then
       ai.pushtask(0, "attack", attacker)
     end
+  elseif task == "runaway" then
+    if ai.target() ~= attacker then
+      ai.poptask()
+      ai.pushtask(0, "runaway", attacker)
+    end
   end
 end
 

scripts/ai/tpl/scout.lua

@@ -14,7 +14,7 @@ function control()
     enemy = ai.getenemy()
 
     -- There is an enemy.
-    if enemy ~= 0 then
+    if enemy ~= nil then
       if ai.dist(enemy) < enemy_dist or ai.haslockon() then
         ai.pushtask(0, "runaway", enemy)
         return