fixed assert in VirtualFileSystem

Author: tomasstupka

graalpython/org.graalvm.python.embedding/src/org/graalvm/python/embedding/utils/VirtualFileSystem.java

@@ -538,7 +538,7 @@ private Path getExtractedPath(Path path) {
                 if (entry instanceof FileEntry fileEntry) {
                     // first create parent dirs
                     Path parent = xPath.getParent();
-                    assert parent == null || Files.isDirectory(parent);
+                    assert parent == null || !Files.exists(parent) || Files.isDirectory(parent);
                     if (parent == null) {
                         throw new NullPointerException("Parent is null during extracting path.");
                     }

graalpython/org.graalvm.python.embedding/src/org/graalvm/python/embedding/vfs/VirtualFileSystem.java

@@ -534,7 +534,7 @@ private Path getExtractedPath(Path path) {
                 if (entry instanceof FileEntry fileEntry) {
                     // first create parent dirs
                     Path parent = xPath.getParent();
-                    assert parent == null || Files.isDirectory(parent);
+                    assert parent == null || !Files.exists(parent) || Files.isDirectory(parent);
                     if (parent == null) {
                         throw new NullPointerException("Parent is null during extracting path.");
                     }