From 7add6858fc05775f1702377e9d05c5978f809ed3 Mon Sep 17 00:00:00 2001
From: "Gerber, Mike" <mike.gerber@sbb.spk-berlin.de>
Date: Wed, 3 Mar 2021 16:17:14 +0100
Subject: [PATCH] =?UTF-8?q?=F0=9F=90=9B=20ppn2ocr:=20Gracefully=20handle?=
 =?UTF-8?q?=20documents=20without=20DEFAULT,=20e.g.=20multi-volume=20works?=
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---
 ppn2ocr | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/ppn2ocr b/ppn2ocr
index e7184e3..af6540b 100755
--- a/ppn2ocr
+++ b/ppn2ocr
@@ -99,6 +99,10 @@ def make_workspace(ppn, workspace):
     # Duplicate DEFAULT file group into a new file group MAX
     format_ = 'tif'
     file_grp_default = mets.find('//mets:fileGrp[@USE="DEFAULT"]', namespaces=XMLNS)
+
+    if file_grp_default is None:
+         raise ValueError("This document has no DEFAULT file group, could be a multi-volume work")
+
     file_grp_best = deepcopy(file_grp_default)
 
     file_grp_best.attrib['USE'] = 'MAX'