(fixed) Ai bugs

[Joramun]

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FATAL LUA ERROR: Lua Function sys_ai_near: base/monster_ai.lua:2640: attempt to perform arithmetic on a nil value
@@@ LUA STACK @@@
[S:base/monster_ai.lua:2640: attempt to perform arithmetic on a nil value]
@@@@@@

I also had the same kind of problems with :

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local delay_len = dsb_ai(boss_id, AI_DELAY_ACTION, QUERY)

returning nil. (With a Deth Armor)

[Sophia]

I'll change those functions to return the actual integer 0 instead of nil when the value is 0.

Sometimes I kind of dislike that Lua makes a distinction.
Anyway, fixed!

The one consequence of this fix is that a line like

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if (dsb_ai(id, AI_DELAY_ACTION, QUERY))

will now always be true. It'd need to be rewritten as "if (whatever > 0)" to work right.