InjectLogic: Don't try to create null parent

src/main/java/net/fabricmc/loom/configuration/providers/forge/mcpconfig/steplogic/InjectLogic.java

@@ -1,7 +1,7 @@
 /*
  * This file is part of fabric-loom, licensed under the MIT License (MIT).
  *
- * Copyright (c) 2022 FabricMC
+ * Copyright (c) 2022-2023 FabricMC
  *
  * Permission is hereby granted, free of charge, to any person obtaining a copy
  * of this software and associated documentation files (the "Software"), to deal
@@ -53,7 +53,11 @@ public final class InjectLogic implements StepLogic {
 					Path from = iter.next();
 					Path relative = injectedFiles.relativize(from);
 					Path to = fs.getPath(relative.toString().replace(relative.getFileSystem().getSeparator(), "/"));
-					Files.createDirectories(to.getParent());
+
+					if (to.getParent() != null) {
+						Files.createDirectories(to.getParent());
+					}
+
 					Files.copy(from, to, StandardCopyOption.REPLACE_EXISTING);
 				}
 			}