Bot crashes the game during respawn.

[superRaptor911]

Maybe due to referencing previously freed instance.

ERROR: notification: NativeScriptInstance detected crash on method: think
   At: modules/gdnative/nativescript/nativescript.cpp:749.
Dumping the backtrace. Please include this when reporting the bug on https://github.com/godotengine/godot/issues
[1] /lib/x86_64-linux-gnu/libc.so.6(+0x46210) [0x7fad4219a210] (??:0)
[2] /home/raptor/program/bin/godot() [0x14c98c8] (??:?)
[3] /home/raptor/program/bin/godot() [0x2686a9d] (??:?)
[4] godot::Node2D::get_position() const (??:0)
[5] godot::Attack::engageEnemy() (??:0)
[6] godot::Bot::gamemodeDeathmath() (??:0)
[7] godot::Bot::think(float) (??:0)
[8] godot_variant godot::__wrapped_method<godot::Bot, void, float>(void*, void*, void*, int, godot_variant**) (??:0)
[9] /home/raptor/program/bin/godot() [0x2618ae7] (<artificial>:?)
[10] /home/raptor/program/bin/godot() [0xc4e60f] (??:?)
[11] /home/raptor/program/bin/godot() [0xb38596] (??:?)
[12] /home/raptor/program/bin/godot() [0x2a0b35b] (<artificial>:?)
[13] /home/raptor/program/bin/godot() [0x2a29740] (<artificial>:?)
[14] /home/raptor/program/bin/godot() [0x18c4a6f] (??:?)
[15] /home/raptor/program/bin/godot() [0x155b468] (<artificial>:?)
[16] /home/raptor/program/bin/godot() [0xbd90b4] (??:?)
[17] /home/raptor/program/bin/godot() [0x186bb0e] (<artificial>:?)
[18] /home/raptor/program/bin/godot() [0x18a419e] (??:?)
[19] /home/raptor/program/bin/godot() [0x2949ee0] (??:?)
[20] /home/raptor/program/bin/godot() [0x8582dd] (??:?)
[21] /lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0xf3) [0x7fad4217b0b3] (??:0)
[22] /home/raptor/program/bin/godot() [0x86695e] (??:?)
-- END OF BACKTRACE --

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[superRaptor911]

Fixed by bac67d02bf73266598eb25063b41c048c240f350