Fix issue with null check introduced in previous commits for mob comb…

…at. Add no_meet section constant. Extend meet scheme readme.

src/engine/core/schemes/meet/README.md

@@ -5,4 +5,23 @@ description
 ## ini parameters
 
 ```
+close_distance - ?
+close_anim - ?
+close_snd_distance - ?
+close_snd_hello - ?
+close_snd_bye - ?
+close_victim - ?
+far_distance - ?
+far_anim - ?
+far_snd_distance - ?
+far_snd - ?
+far_victim - ?
+snd_on_use - ?
+use - ?
+meet_dialog - ?
+abuse - ?
+trade_enable - ?
+allow_break - ?
+meet_on_talking - ?
+use_text - ?
 ```

src/engine/core/schemes/mob_combat/SchemeMobCombat.ts

@@ -4,7 +4,7 @@ import { ISchemeMobCombatState } from "@/engine/core/schemes/mob_combat/ISchemeM
 import { MobCombatManager } from "@/engine/core/schemes/mob_combat/MobCombatManager";
 import { getConfigSwitchConditions } from "@/engine/core/utils/ini/ini_config";
 import { LuaLogger } from "@/engine/core/utils/logging";
-import { ClientObject, EScheme, ESchemeType, IniFile, TSection } from "@/engine/lib/types";
+import { ClientObject, EScheme, ESchemeType, IniFile, Optional, TSection } from "@/engine/lib/types";
 
 const logger: LuaLogger = new LuaLogger($filename);
 
@@ -37,8 +37,11 @@ export class SchemeMobCombat extends AbstractScheme {
   }
 
   public static override disable(object: ClientObject, scheme: EScheme): void {
-    const state: ISchemeMobCombatState = registry.objects.get(object.id())[scheme] as ISchemeMobCombatState;
+    const state: Optional<ISchemeMobCombatState> = registry.objects.get(object.id())[scheme] as ISchemeMobCombatState;
 
-    state.enabled = false;
+    // No guarantee that it was activated before so should be checked additionally.
+    if (state !== null) {
+      state.enabled = false;
+    }
   }
 }

src/engine/lib/constants/sections.ts

@@ -9,3 +9,8 @@ export const SMART_TERRAIN_SECTION: TName = "smart_terrain";
  * Section representing stalkers that are used only for cutscenes / scenarios (todo: confirm).
  */
 export const ACTOR_VISUAL_STALKER: TName = "actor_visual_stalker";
+
+/**
+ * Section to disable meet scheme.
+ */
+export const NO_MEET_SECTION: TName = "no_meet";