From 40dc929d8f7a86dd9dacf777c74d161975ae2c01 Mon Sep 17 00:00:00 2001
From: Mitchell Young <myoung@terrapower.com>
Date: Tue, 4 Feb 2020 09:43:12 -0800
Subject: [PATCH] Add default value for compiledExclusions

---
 armi/bookkeeping/db/compareDB3.py | 1 +
 1 file changed, 1 insertion(+)

diff --git a/armi/bookkeeping/db/compareDB3.py b/armi/bookkeeping/db/compareDB3.py
index b6b1cda55..69c72f3fe 100644
--- a/armi/bookkeeping/db/compareDB3.py
+++ b/armi/bookkeeping/db/compareDB3.py
@@ -161,6 +161,7 @@ def compareDatabases(
     tolerance: float = 0.0,
 ) -> Optional[DiffResults]:
 
+    compiledExclusions = None
     if exclusions is not None:
         compiledExclusions = [re.compile(ex) for ex in exclusions]