Fix timer error for invalid entity

[bjurd]

Timer can fire after the entity has been removed

Error variable trace (ignore the stdout color control chars)

�[38;2;156;241;255mTraces of level 1 (Execute)
�[39m�[38;2;156;241;255m- Local 1 (Level) (number) = 1
�[39m�[38;2;156;241;255m- Local 2 (Info) (table) = table: 0x80887ef681ce68b2
�[39m�[38;2;156;241;255m- Local 3 (Indent) (string) = 
�[39m�[38;2;156;241;255m- Local 4 (Function) (function) = function: 0x80887ef6b2cb1ffa
�[39m�[38;2;156;241;255m- Local 5 (FunctionName) (string) = Execute
�[39m�[38;2;156;241;255m- Local 6 (Local) (number) = 6
�[39m�[38;2;156;241;255m	Traces of level 2 ([Unknown Function])
�[39m�[38;2;156;241;255m	- UpValue 1 (ent) (Entity) = Entity [Invalid]
�[39m�[38;2;156;241;255m	- UpValue 2 (callback) (function) = function: 0x80887ef6fcac4bba
�[39m�[38;2;156;241;255m	- UpValue 3 (internalName) (string) = 479_gmod_wire_expression2_luatimer_simpletimer_19
�[39m�[38;2;156;241;255m	- UpValue 4 (luaTimers) (table) = table: 0x80887ef6b1cb69b2
�[39m�[38;2;156;241;255m	- UpValue 5 (entIndex) (number) = 479
�[39m�[38;2;156;241;255m	- UpValue 6 (name) (string) = simpletimer_19
�[39m�[38;2;156;241;255m	- Local 1 ((*temporary)) (nil) = nil
�[39m�[38;2;156;241;255m	- Local 2 ((*temporary)) (number) = 6.4624744847913e-310
�[39m�[38;2;156;241;255m	- Local 3 ((*temporary)) (Entity) = Entity [Invalid]
�[39m�[38;2;156;241;255m	- Local 4 ((*temporary)) (function) = function: 0x80887ef6fcac4bba
�[39m�[38;2;156;241;255m	- Local 5 ((*temporary)) (string) = attempt to call method 'Execute' (a nil value)
�[39m�[38;2;156;241;255m
[ERROR] entities/gmod_wire_expression2/core/timer.lua:107: attempt to call method 'Execute' (a nil value)
  1. unknown - entities/gmod_wire_expression2/core/timer.lua:107

�[39m�[38;2;156;241;255mTimer Failed! [479_gmod_wire_expression2_luatimer_simpletimer_19][@entities/gmod_wire_expression2/core/timer.lua (line 106)]

[Astralcircle]

Unfortunately, this isn't a solution. The problem is deeper and lies in the fact that the destruct hook isn't being called (i should fix it someday)

[wrefgtzweve]

Unfortunately, this isn't a solution. The problem is deeper and lies in the fact that the destruct hook isn't being called (i should fix it someday)

True but in the meanwhile it shouldn't error, i think

[Astralcircle]

I'll try to fix the root of the issue today, if that doesn't work then i'll just merge this pr

[Astralcircle]

Also, adding a simple IsValid won't remove the buggy timers on error, which is even worse. So, i'd better close the PR