[vcs-log] do not schedule indexing if index is disposed

platform/vcs-log/impl/src/com/intellij/vcs/log/data/index/VcsLogPersistentIndex.java

@@ -137,6 +137,7 @@ public class VcsLogPersistentIndex implements VcsLogIndex, Disposable {
 
   @Override
   public synchronized void scheduleIndex(boolean full) {
+    if (Disposer.isDisposed(this)) return;
     if (myCommitsToIndex.isEmpty() || myIndexStorage == null) return;
     // for fresh index, wait for complete log to load and index everything in one command
     if (myIndexStorage.isFresh() && !full) return;