Merge branch 'stable-5.0'

* stable-5.0:
  Fix NoSuchFileException in GC.deleteTempPacksIdx()
  Fix NoSuchFileException during directory cleanup in RefDirectory

Change-Id: I35bd4bcbeac2430f674ccb6b947ac3776cec8a82
Signed-off-by: David Pursehouse <david.pursehouse@gmail.com>

org.eclipse.jgit/src/org/eclipse/jgit/internal/storage/file/GC.java

@@ -997,6 +997,9 @@ public class GC {
 	private void deleteTempPacksIdx() {
 		Path packDir = repo.getObjectDatabase().getPackDirectory().toPath();
 		Instant threshold = Instant.now().minus(1, ChronoUnit.DAYS);
+		if (!Files.exists(packDir)) {
+			return;
+		}
 		try (DirectoryStream<Path> stream =
 				Files.newDirectoryStream(packDir, "gc_*_tmp")) { //$NON-NLS-1$
 			stream.forEach(t -> {

org.eclipse.jgit/src/org/eclipse/jgit/internal/storage/file/RefDirectory.java

@@ -1287,7 +1287,7 @@ public class RefDirectory extends RefDatabase {
 		File dir = file.getParentFile();
 		for (int i = 0; i < depth; ++i) {
 			try {
-				Files.delete(dir.toPath());
+				Files.deleteIfExists(dir.toPath());
 			} catch (DirectoryNotEmptyException e) {
 				// Don't log; normal case when there are other refs with the
 				// same prefix