Crash due to mob being null when using spawner.json
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Got a crash due to mob being null when passed in here, due to magma blocks running isFireImmune on the EntityType to check if it is a valid spawn: SpawnerSystem.java#L159. The parameter is annotated @Nullable but that doesn't seem to of been checked here.
java.lang.NullPointerException: Cannot invoke "net.minecraft.world.entity.EntityType.m_20672_()" because "p_187424_" is null
at net.minecraft.world.level.block.Blocks.lambda$static$33(Blocks.java:647) ~[client-1.19.2-20220805.130853-srg.jar%23225!/:?] {re:classloading,pl:accesstransformer:B,pl:object_holder_definalize:A}
at net.minecraft.world.level.block.state.BlockBehaviour$BlockStateBase.m_60643_(BlockBehaviour.java:486) ~[client-1.19.2-20220805.130853-srg.jar%23225!/:?] {re:mixin,re:classloading,pl:mixin:APP:kubejs-common.mixins.json:BlockStateBaseMixin,pl:mixin:A}
at mcjty.incontrol.spawner.SpawnerSystem.isValidSpawn(SpawnerSystem.java:465) ~[incontrol-1.19-7.1.10.jar%23201!/:1.19-7.1.10] {re:classloading}
at mcjty.incontrol.spawner.SpawnerSystem.lambda$getValidPosConditions$2(SpawnerSystem.java:407) ~[incontrol-1.19-7.1.10.jar%23201!/:1.19-7.1.10] {re:classloading}
at mcjty.incontrol.spawner.SpawnerSystem.getValidSpawnablePosition(SpawnerSystem.java:458) ~[incontrol-1.19-7.1.10.jar%23201!/:1.19-7.1.10] {re:classloading}
at mcjty.incontrol.spawner.SpawnerSystem.getRandomPositionOnGround(SpawnerSystem.java:376) ~[incontrol-1.19-7.1.10.jar%23201!/:1.19-7.1.10] {re:classloading}
at mcjty.incontrol.spawner.SpawnerSystem.getRandomPosition(SpawnerSystem.java:286) ~[incontrol-1.19-7.1.10.jar%23201!/:1.19-7.1.10] {re:classloading}
at mcjty.incontrol.spawner.SpawnerSystem.executeRule(SpawnerSystem.java:159) ~[incontrol-1.19-7.1.10.jar%23201!/:1.19-7.1.10] {re:classloading}
