In minecraft 1.8.9 i found a spawner that has nothing in it and a empty chest in a dungeon

Here is a force crash 

---- Minecraft Crash Report ----
// Don't be sad, have a hug! <3

Time: 1/17/16 11:02 PM
Description: Manually triggered debug crash

java.lang.Throwable
	at ave.s(SourceFile:1588)
	at ave.av(SourceFile:889)
	at ave.a(SourceFile:325)
	at net.minecraft.client.main.Main.main(SourceFile:124)


A detailed walkthrough of the error, its code path and all known details is as follows:
---------------------------------------------------------------------------------------

-- Head --
Stacktrace:
	at bdb.a(SourceFile:309)

-- Affected level --
Details:
	Level name: MpServer
	All players: 1 total; [bew['Trialdragon'/11322, l='MpServer', x=19.30, y=55.00, z=285.25]]
	Chunk stats: MultiplayerChunkCache: 81, 81
	Level seed: 0
	Level generator: ID 00 - default, ver 1. Features enabled: false
	Level generator options: 
	Level spawn location: 148.00,64.00,252.00 - World: (148,64,252), Chunk: (at 4,4,12 in 9,15; contains blocks 144,0,240 to 159,255,255), Region: (0,0; contains chunks 0,0 to 31,31, blocks 0,0,0 to 511,255,511)
	Level time: 71946 game time, 71946 day time
	Level dimension: 0
	Level storage version: 0x00000 - Unknown?
	Level weather: Rain time: 0 (now: false), thunder time: 0 (now: false)
	Level game mode: Game mode: survival (ID 0). Hardcore: false. Cheats: false
	Forced entities: 43 total; [uz['item.item.egg'/11200, l='MpServer', x=59.38, y=78.00, z=310.03], tn['Chicken'/11201, l='MpServer', x=55.28, y=80.00, z=308.50], uz['item.item.egg'/11202, l='MpServer', x=56.22, y=80.00, z=307.72], vn['Creeper'/11203, l='MpServer', x=48.31, y=66.00, z=336.47], we['Zombie'/11147, l='MpServer', x=-1.44, y=68.00, z=230.03], tn['Chicken'/11148, l='MpServer', x=-8.69, y=67.00, z=253.47], tn['Chicken'/11149, l='MpServer', x=-15.34, y=68.00, z=256.53], tn['Chicken'/11150, l='MpServer', x=-15.66, y=70.00, z=237.31], tn['Chicken'/11151, l='MpServer', x=-13.91, y=69.00, z=252.22], uz['item.item.egg'/11152, l='MpServer', x=-6.84, y=68.00, z=244.53], uz['item.item.egg'/11153, l='MpServer', x=-15.19, y=69.00, z=251.16], tn['Chicken'/11154, l='MpServer', x=-11.63, y=67.00, z=254.72], wa['Skeleton'/11155, l='MpServer', x=-9.44, y=72.00, z=353.03], we['Zombie'/11220, l='MpServer', x=72.72, y=58.00, z=219.75], we['Zombie'/11221, l='MpServer', x=73.53, y=58.00, z=218.88], vn['Creeper'/11222, l='MpServer', x=72.06, y=49.00, z=212.06], wa['Skeleton'/11223, l='MpServer', x=76.50, y=54.00, z=232.50], tn['Chicken'/11224, l='MpServer', x=64.94, y=79.00, z=307.91], tn['Chicken'/11225, l='MpServer', x=68.50, y=78.00, z=318.47], uz['item.item.egg'/11417, l='MpServer', x=67.61, y=76.00, z=318.31], uz['item.item.egg'/11227, l='MpServer', x=65.41, y=79.00, z=307.44], tn['Chicken'/11164, l='MpServer', x=9.53, y=65.00, z=234.66], uz['item.item.egg'/11165, l='MpServer', x=9.78, y=65.00, z=233.94], tn['Chicken'/11166, l='MpServer', x=3.56, y=67.00, z=253.72], uz['item.item.egg'/11167, l='MpServer', x=3.56, y=67.00, z=253.84], tn['Chicken'/11103, l='MpServer', x=-39.41, y=70.00, z=255.63], tk['Bat'/11168, l='MpServer', x=9.41, y=54.10, z=266.47], tn['Chicken'/11104, l='MpServer', x=-40.56, y=75.00, z=256.66], tn['Chicken'/11169, l='MpServer', x=7.38, y=64.00, z=320.38], tn['Chicken'/11176, l='MpServer', x=22.34, y=75.00, z=247.47], tn['Chicken'/11177, l='MpServer', x=18.66, y=72.00, z=254.34], uz['item.item.egg'/11178, l='MpServer', x=21.16, y=74.00, z=248.19], tn['Chicken'/11179, l='MpServer', x=25.63, y=68.00, z=317.34], tn['Chicken'/11180, l='MpServer', x=24.56, y=67.00, z=315.41], uz['item.item.egg'/11181, l='MpServer', x=26.47, y=68.00, z=317.22], uz['item.item.egg'/11182, l='MpServer', x=24.50, y=67.00, z=315.47], tn['Chicken'/11183, l='MpServer', x=30.28, y=69.00, z=337.50], tn['Chicken'/11190, l='MpServer', x=42.31, y=70.00, z=327.44], uz['item.item.egg'/11191, l='MpServer', x=41.66, y=70.00, z=327.16], bew['Trialdragon'/11322, l='MpServer', x=19.30, y=55.00, z=285.25], tn['Chicken'/11198, l='MpServer', x=61.38, y=79.00, z=306.59], tn['Chicken'/11134, l='MpServer', x=-26.44, y=76.00, z=261.59], tn['Chicken'/11199, l='MpServer', x=58.47, y=78.00, z=310.63]]
	Retry entities: 0 total; []
	Server brand: vanilla
	Server type: Integrated singleplayer server
Stacktrace:
	at bdb.a(SourceFile:309)
	at ave.b(SourceFile:2311)
	at ave.a(SourceFile:334)
	at net.minecraft.client.main.Main.main(SourceFile:124)

-- System Details --
Details:
	Minecraft Version: 1.8.9
	Operating System: Windows 8.1 (amd64) version 6.3
	Java Version: 1.8.0_25, Oracle Corporation
	Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
	Memory: 176049400 bytes (167 MB) / 532811776 bytes (508 MB) up to 1060372480 bytes (1011 MB)
	JVM Flags: 6 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx1G -XX:+UseConcMarkSweepGC -XX:+CMSIncrementalMode -XX:-UseAdaptiveSizePolicy -Xmn128M
	IntCache: cache: 0, tcache: 23, allocated: 12, tallocated: 94
	Launched Version: 1.8.9-mcpatcher
	LWJGL: 2.9.4
	OpenGL: AMD Radeon HD 7540D GL version 4.4.13293 Compatibility Profile Context 14.502.1019.0, ATI Technologies Inc.
	GL Caps: Using GL 1.3 multitexturing.
Using GL 1.3 texture combiners.
Using framebuffer objects because OpenGL 3.0 is supported and separate blending is supported.
Shaders are available because OpenGL 2.1 is supported.
VBOs are available because OpenGL 1.5 is supported.

	Using VBOs: No
	Is Modded: Very likely; Jar signature invalidated
	Type: Client (map_client.txt)
	Resource Packs: 
	Current Language: English (US)
	Profiler Position: N/A (disabled)
	CPU: 2x AMD A6-5400K APU with Radeon(tm) HD Graphics