SCR_EditorManagerCore FIX

Im doing your job Bohemia where is my pay check lmao!

Fix for

Virtual Machine Exception 
Reason: NULL pointer to instance 
Class:      'SCR_EditorManagerCore' 
Function: 'DeleteEditorManager' 
Stack trace: 
scripts/Game/Editor/Core/SCR_EditorManagerCore.c:160 Function DeleteEditorManager 
scripts/Game/Editor/Core/SCR_EditorManagerCore.c:400 Function OnPlayerDisconnected 
scripts/Game/GameMode/SCR_BaseGameMode.c:927 Function OnPlayerDisconnected 
scripts/Game/Core/CER_MovementSettingsGameMode.c:35 Function OnPlayerDisconnected 
scripts/Game/ACE_Core/GameMode/SCR_BaseGameMode.c:8 Function OnPlayerDisconnected 
scripts/Game/CERPERSISTENTRANKS/PersistentRank/CER_PersistentRank.c:649 Function OnPlayerDisconnected 
scripts/Game/SSZ_SafezoneManager.c:96 Function OnPlayerDisconnected 
scripts/Game/BetterArma_GM.c:113 Function OnPlayerDisconnected 
scripts/Game/GameMode/SCR_GameModeCampaign.c:1121 Function OnPlayerDisconnected 


Runtime mode 
CLI params: gproj ./addons/data/ArmaReforger.gproj config ./config.json profile ./profile backendlog  nothrow  listScenarios  logStats 30000 logLevel normal maxFPS 120 autoreload 30 addonTempDir ./tmp freezecheck 30 freezeCheckMode kill rpl-timeout-ms 10000