PEL: Make action flags optional in the registry

A future commit will fill in the field if it isn't
present.

Signed-off-by: Matt Spinler <spinler@us.ibm.com>
Change-Id: I67371433162ce2198a362796d274695a1bd6a6dc
diff --git a/extensions/openpower-pels/user_header.cpp b/extensions/openpower-pels/user_header.cpp
index 6dfbc09..f4337f3 100644
--- a/extensions/openpower-pels/user_header.cpp
+++ b/extensions/openpower-pels/user_header.cpp
@@ -56,7 +56,7 @@
     _problemDomain = 0;
     _problemVector = 0;
 
-    _actionFlags = entry.actionFlags;
+    _actionFlags = entry.actionFlags.value_or(0);
 
     _reserved4Byte2 = 0;