ChangeRebuilderImpl: Ignore invalid author when getting hashtags

This can happen when processing a commit by the InternalUser. Such a
user can't set hashtags, so this is safe to ignore.

Change-Id: Ie609cdf34a1532695a64d9b2ffe41a2dbb5880db
diff --git a/gerrit-server/src/main/java/com/google/gerrit/server/notedb/ChangeRebuilderImpl.java b/gerrit-server/src/main/java/com/google/gerrit/server/notedb/ChangeRebuilderImpl.java
index b332967..c7aca4a 100644
--- a/gerrit-server/src/main/java/com/google/gerrit/server/notedb/ChangeRebuilderImpl.java
+++ b/gerrit-server/src/main/java/com/google/gerrit/server/notedb/ChangeRebuilderImpl.java
@@ -225,7 +225,7 @@
   }
 
   private void buildUpdates(NoteDbUpdateManager manager, ChangeBundle bundle)
-      throws IOException, OrmException, ConfigInvalidException {
+      throws IOException, OrmException {
     Change change = new Change(bundle.getChange());
     // We will rebuild all events, except for draft comments, in buckets based
     // on author and timestamp.
@@ -366,7 +366,7 @@
   }
 
   private List<HashtagsEvent> getHashtagsEvents(Change change,
-      NoteDbUpdateManager manager) throws IOException, ConfigInvalidException {
+      NoteDbUpdateManager manager) throws IOException {
     String refName = ChangeNoteUtil.changeRefName(change.getId());
     ObjectId old = manager.getChangeRepo().getObjectId(refName);
     if (old == null) {
@@ -378,8 +378,13 @@
     rw.reset();
     rw.markStart(rw.parseCommit(old));
     for (RevCommit commit : rw) {
-      Account.Id authorId =
-          changeNoteUtil.parseIdent(commit.getAuthorIdent(), change.getId());
+      Account.Id authorId;
+      try {
+        authorId =
+            changeNoteUtil.parseIdent(commit.getAuthorIdent(), change.getId());
+      } catch (ConfigInvalidException e) {
+        continue; // Corrupt data, no valid hashtags in this commit.
+      }
       PatchSet.Id psId = parsePatchSetId(change, commit);
       Set<String> hashtags = parseHashtags(commit);
       if (authorId == null || psId == null || hashtags == null) {