fix: Assets not downloading for Minecraft (thanks @natowb)

Author: PhoenixVX

src/main/java/org/mcphackers/mcp/tasks/TaskDecompile.java

@@ -97,6 +97,14 @@ protected Stage[] setStages() {
 				FileUtil.deletePackages(ffOut, mcp.getOptions().getStringArrayParameter(TaskParameter.IGNORED_PACKAGES));
 				FileUtil.copyDirectory(ffOut, srcPath);
 			}
+
+			// Copy asset indexes if client/merged
+			if (side.includesClient()) {
+				Path assets = MCPPaths.get(mcp, JARS).resolve("assets");
+				if (Files.exists(assets)) {
+					FileUtil.copyDirectory(assets, MCPPaths.get(mcp, GAMEDIR, side).resolve("assets"));
+				}
+			}
 		}), stage(getLocalizedStage("recompile"), 95, () -> new TaskUpdateMD5(side, mcp, this).doTask()),};
 	}
 

src/main/java/org/mcphackers/mcp/tasks/TaskRecompile.java

@@ -205,7 +205,7 @@ public void recompile(MCP mcp, Side side, String javaHome, Iterable<File> src, I
 		boolean isWindows = OS.getOs().equals(OS.windows);
 		Path javac = Paths.get(javaHome).resolve("bin").resolve(isWindows ? "javac.exe" : "javac");
 		if (!Files.exists(javac)) {
-			throw new RuntimeException("Failed to find javac in " + javaHome);
+			throw new RuntimeException("Failed to find javac at " + javac.toAbsolutePath());
 		}
 
 		Path binDir = MCPPaths.get(mcp, BIN, side);

src/main/java/org/mcphackers/mcp/tools/versions/DownloadData.java

@@ -65,6 +65,7 @@ public DownloadData(MCP mcp, Path libraries, Path gameDir, Path client, Path ser
 		}
 		try {
 			Path assetIndex = gameDir.resolve("assets/indexes/" + version.assets + ".json");
+			Files.createDirectories(assetIndex.getParent());
 			String assetIndexString;
 			if (!Files.exists(assetIndex) || !version.assetIndex.sha1.equals(Util.getSHA1(assetIndex))) {
 				assetIndexString = new String(Util.readAllBytes(FileUtil.openURLStream(new URL(version.assetIndex.url))));