Skip chunks that havent finished generating enough

Fixes #1

src/main/java/com/technicjelle/bluemapsignextractor/common/Chunk.java

@@ -1,7 +1,26 @@
 package com.technicjelle.bluemapsignextractor.common;
 
+import java.util.Set;
+
 public interface Chunk {
+	Set<String> FINISHED_STATUSES = Set.of(
+			//1.20:               //1.14 - 1.18:
+			"minecraft:features", "features",
+			"minecraft:light", "light", //the wiki says this exists, but I cannot find it anywhere
+			"minecraft:initialize_light", "initialize_light", //this one isn't on the wiki, but it's in my test world files
+			"minecraft:spawn", "spawn",
+			"minecraft:full", "full",
+			//1.13:
+			"carved",
+			"liquid_carved",
+			"decorated",
+			"postprocessed",
+			"fullchunk"
+	);
+
 	BlockEntity[] getBlockEntities();
 
 	int getDataVersion();
+
+	boolean isGenerated();
 }

src/main/java/com/technicjelle/bluemapsignextractor/common/MCA.java

@@ -62,6 +62,8 @@ public ArrayList<BlockEntity> getBlockEntities() throws IOException {
 					chunk = nbt.read(reader2, chunkClass);
 				}
 
+				if (!chunk.isGenerated()) continue;
+
 				BlockEntity[] chunkBlockEntities = chunk.getBlockEntities();
 				if (chunkBlockEntities == null) {
 					throw new IOException("chunkBlockEntities was null in chunk " + x + ", " + z + " in region file " + regionFile.toAbsolutePath() + "\n" +

src/main/java/com/technicjelle/bluemapsignextractor/versions/MC_1_13_2/MC_1_13_2_Chunk.java

@@ -9,6 +9,9 @@ public class MC_1_13_2_Chunk extends ChunkWithVersion implements Chunk {
 	static class Level {
 		@NBTName("TileEntities")
 		public MC_1_13_2_Sign[] tileEntities;
+
+		@NBTName("Status")
+		private String status;
 	}
 
 	@NBTName("Level")
@@ -18,4 +21,9 @@ static class Level {
 	public BlockEntity[] getBlockEntities() {
 		return level.tileEntities;
 	}
+
+	@Override
+	public boolean isGenerated() {
+		return Chunk.FINISHED_STATUSES.contains(level.status);
+	}
 }

src/main/java/com/technicjelle/bluemapsignextractor/versions/MC_1_14_4/MC_1_14_4_Chunk.java

@@ -9,6 +9,9 @@ public class MC_1_14_4_Chunk extends ChunkWithVersion implements Chunk {
 	static class Level {
 		@NBTName("TileEntities")
 		public MC_1_14_4_Sign[] tileEntities;
+
+		@NBTName("Status")
+		private String status;
 	}
 
 	@NBTName("Level")
@@ -18,4 +21,9 @@ static class Level {
 	public BlockEntity[] getBlockEntities() {
 		return level.tileEntities;
 	}
+
+	@Override
+	public boolean isGenerated() {
+		return Chunk.FINISHED_STATUSES.contains(level.status);
+	}
 }

src/main/java/com/technicjelle/bluemapsignextractor/versions/MC_1_17_1/MC_1_17_1_Chunk.java

@@ -9,6 +9,9 @@ public class MC_1_17_1_Chunk extends ChunkWithVersion implements Chunk {
 	static class Level {
 		@NBTName("TileEntities")
 		public MC_1_17_1_Sign[] tileEntities;
+
+		@NBTName("Status")
+		private String status;
 	}
 
 	@NBTName("Level")
@@ -18,4 +21,9 @@ static class Level {
 	public BlockEntity[] getBlockEntities() {
 		return level.tileEntities;
 	}
+
+	@Override
+	public boolean isGenerated() {
+		return Chunk.FINISHED_STATUSES.contains(level.status);
+	}
 }

src/main/java/com/technicjelle/bluemapsignextractor/versions/MC_1_18_2/MC_1_18_2_Chunk.java

@@ -10,8 +10,16 @@ public class MC_1_18_2_Chunk extends ChunkWithVersion implements Chunk {
 	@NBTName("block_entities")
 	private MC_1_17_1_Sign[] blockEntities; //The actual sign format hasn't changed, only the chunk format has
 
+	@NBTName("Status")
+	private String status;
+
 	@Override
 	public BlockEntity[] getBlockEntities() {
 		return blockEntities;
 	}
+
+	@Override
+	public boolean isGenerated() {
+		return Chunk.FINISHED_STATUSES.contains(status);
+	}
 }

src/main/java/com/technicjelle/bluemapsignextractor/versions/MC_1_20_4/MC_1_20_4_Chunk.java

@@ -9,9 +9,16 @@ public class MC_1_20_4_Chunk extends ChunkWithVersion implements Chunk {
 	@NBTName("block_entities")
 	private MC_1_20_4_Sign[] blockEntities;
 
+	@NBTName("Status")
+	private String status;
+
 	@Override
 	public BlockEntity[] getBlockEntities() {
-		if (blockEntities == null) System.err.println("no block entities found here");
 		return blockEntities;
 	}
+
+	@Override
+	public boolean isGenerated() {
+		return Chunk.FINISHED_STATUSES.contains(status);
+	}
 }

src/test/java/LoadRegionsTest.java

@@ -76,8 +76,8 @@ public void test_MC_1_20_4_Upgraded() throws IOException {
 	public void test_MC_1_20_4_IncompleteChunk() throws IOException {
 		//Chunk files with incompletely generated chunks.
 		// Thanks to GitHub user @bold-gman for providing these files.
-		testMCAFile("/MC_1_20_4/r.-2.5.mca", 1);
-		testMCAFile("/MC_1_20_4/r.-98.8.mca", 1);
+		testMCAFile("/MC_1_20_4/r.-2.5.mca", 0);
+		testMCAFile("/MC_1_20_4/r.-98.8.mca", 0);
 	}
 
 	@Test