fix: Fix crash due to missing null checks for certain block colors

src/main/java/io/github/steveplays28/simpleseasons/mixin/client/BlockColorsMixin.java

@@ -10,6 +10,8 @@
 import net.minecraft.client.color.world.FoliageColors;
 import net.minecraft.util.math.BlockPos;
 import net.minecraft.world.BlockRenderView;
+import org.jetbrains.annotations.NotNull;
+import org.jetbrains.annotations.Nullable;
 import org.spongepowered.asm.mixin.Mixin;
 import org.spongepowered.asm.mixin.injection.At;
 import org.spongepowered.asm.mixin.injection.Inject;
@@ -20,7 +22,7 @@
 @Mixin(BlockColors.class)
 public class BlockColorsMixin {
 	@Inject(method = "create", at = @At(value = "RETURN"), locals = LocalCapture.CAPTURE_FAILSOFT)
-	private static void simple_seasons$createInject(CallbackInfoReturnable<BlockColors> cir, BlockColors blockColors) {
+	private static void simple_seasons$createInject(@NotNull CallbackInfoReturnable<BlockColors> cir, @NotNull BlockColors blockColors) {
 		// Grab all registered blocks from the API
 		Block[] registeredBlocks = BlockColorProviderRegistry.getRegisteredBlocks().toArray(new Block[0]);
 
@@ -34,14 +36,22 @@ public class BlockColorsMixin {
 		}, registeredBlocks);
 	}
 
-	@Inject(method = {"method_1695", "method_1687", "method_1684"}, at = @At(value = "RETURN"), cancellable = true)
-	private static void simple_seasons$modifyLeafAndLilyPadColors(BlockState blockState, BlockRenderView world, BlockPos blockPos, int tintIndex, CallbackInfoReturnable<Integer> cir) {
+	@Inject(method = {"method_1695", "method_1687", "method_1684"}, at = @At(value = "HEAD"), cancellable = true)
+	private static void simple_seasons$modifyLeafAndLilyPadColors(@NotNull BlockState blockState, @Nullable BlockRenderView world, @Nullable BlockPos blockPos, int tintIndex, @NotNull CallbackInfoReturnable<Integer> cir) {
+		if (world == null || blockPos == null) {
+			return;
+		}
+
 		cir.setReturnValue(BiomeColors.getFoliageColor(world, blockPos));
 	}
 
 	// TODO: Reimplement stem block ageing colors
 	@Inject(method = "method_1696", at = @At(value = "HEAD"), cancellable = true)
-	private static void simple_seasons$modifyStemColor(BlockState state, BlockRenderView world, BlockPos blockPos, int tintIndex, CallbackInfoReturnable<Integer> cir) {
+	private static void simple_seasons$modifyStemColor(@NotNull BlockState blockState, @Nullable BlockRenderView world, @Nullable BlockPos blockPos, int tintIndex, @NotNull CallbackInfoReturnable<Integer> cir) {
+		if (world == null || blockPos == null) {
+			return;
+		}
+
 		cir.setReturnValue(BiomeColors.getFoliageColor(world, blockPos));
 	}
 }