fix attempted bed spawn when no bed is registered

[ItsOnlyBinary]

papermc seems to no longer fire a NullPointerException when attempting to spawn a player who does not have a bed, it instead fires IllegalArgumentException

so i have switched it to checking for null before attempting a bed spawn

[Narimm]

Mate could you post a stack trace of why this is required and under what versions you have had it occur

[ItsOnlyBinary]

[17:54:37] [Server thread/INFO]: Player7777 issued server command: /spawn
[17:54:40] [Server thread/WARN]: [geSuitSpawn] Task #710724 for geSuitSpawn v1.0.0-SNAPSHOT- generated an exception
java.lang.IllegalArgumentException: location
	at com.google.common.base.Preconditions.checkArgument(Preconditions.java:122) ~[patched_1.14.4.jar:git-Paper-207]
	at org.bukkit.craftbukkit.v1_14_R1.entity.CraftPlayer.teleport(CraftPlayer.java:741) ~[patched_1.14.4.jar:git-Paper-207]
	at org.bukkit.craftbukkit.v1_14_R1.entity.CraftEntity.teleport(CraftEntity.java:489) ~[patched_1.14.4.jar:git-Paper-207]
	at net.cubespace.geSuiteSpawn.managers.SpawnManager.sendPlayerToSpawn(SpawnManager.java:198) ~[?:?]
	at net.cubespace.geSuiteSpawn.commands.SpawnCommand.lambda$onCommand$0(SpawnCommand.java:70) ~[?:?]
	at org.bukkit.craftbukkit.v1_14_R1.scheduler.CraftTask.run(CraftTask.java:84) ~[patched_1.14.4.jar:git-Paper-207]
	at org.bukkit.craftbukkit.v1_14_R1.scheduler.CraftScheduler.mainThreadHeartbeat(CraftScheduler.java:452) ~[patched_1.14.4.jar:git-Paper-207]
	at net.minecraft.server.v1_14_R1.MinecraftServer.b(MinecraftServer.java:1171) ~[patched_1.14.4.jar:git-Paper-207]
	at net.minecraft.server.v1_14_R1.DedicatedServer.b(DedicatedServer.java:417) ~[patched_1.14.4.jar:git-Paper-207]
	at net.minecraft.server.v1_14_R1.MinecraftServer.a(MinecraftServer.java:1098) ~[patched_1.14.4.jar:git-Paper-207]
	at net.minecraft.server.v1_14_R1.MinecraftServer.run(MinecraftServer.java:925) ~[patched_1.14.4.jar:git-Paper-207]
	at java.lang.Thread.run(Thread.java:748) [?:1.8.0_222]

This server is running Paper version git-Paper-207 (MC: 1.14.4) (Implementing API version 1.14.4-R0.1-SNAPSHOT)