From 869e2b9b803f336678acd42fc7deefc49f374918 Mon Sep 17 00:00:00 2001
From: Dmitry Batkovich <dmitry.batkovich@jetbrains.com>
Date: Thu, 26 Jan 2017 18:34:43 +0300
Subject: [PATCH] javac ast indices: dirty scope calculation: fix case of empty
 dirty scope

---
 .../com/intellij/compiler/backwardRefs/DirtyScopeHolder.java  | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/java/compiler/impl/src/com/intellij/compiler/backwardRefs/DirtyScopeHolder.java b/java/compiler/impl/src/com/intellij/compiler/backwardRefs/DirtyScopeHolder.java
index e759aa0dfba5..c97664720d28 100644
--- a/java/compiler/impl/src/com/intellij/compiler/backwardRefs/DirtyScopeHolder.java
+++ b/java/compiler/impl/src/com/intellij/compiler/backwardRefs/DirtyScopeHolder.java
@@ -165,7 +165,9 @@ public class DirtyScopeHolder extends UserDataHolderBase {
   }
 
   private GlobalSearchScope calculateDirtyScope() {
-    GlobalSearchScope dirtyModuleScope = GlobalSearchScope.union(getAllDirtyModules()
+    final Set<Module> dirtyModules = getAllDirtyModules();
+    if (dirtyModules.isEmpty()) return myExcludedFilesScope;
+    GlobalSearchScope dirtyModuleScope = GlobalSearchScope.union(dirtyModules
                                                                    .stream()
                                                                    .map(Module::getModuleWithDependentsScope)
                                                                    .toArray(GlobalSearchScope[]::new));