X-Git-Url: https://git.mdrn.pl/librarian.git/blobdiff_plain/25af49b6c63e1c005129856e107143864ad5b245..d8393802a7cb8d84a3b3c989ea30b4ba21d9a8da:/librarian/formats/cover/evens/__init__.py

diff --git a/librarian/formats/cover/evens/__init__.py b/librarian/formats/cover/evens/__init__.py
index 4207d46..e07f78b 100644
--- a/librarian/formats/cover/evens/__init__.py
+++ b/librarian/formats/cover/evens/__init__.py
@@ -18,12 +18,13 @@ class EvensCover(Cover):
     title_top = 30
     logo_bottom = 100
 
-    def __init__(self, doc, format=None, width=None, height=None):
-        super(EvensCover, self).__init__(doc, format=format, width=width, height=height)
-        self.doc = doc
-
     def set_images(self, ctx):
-        cover_url = self.doc.meta.get(DCNS('relation.coverimage.url'))[0]
+        try:
+            cover_url = self.doc.meta.get(DCNS('relation.coverimage.url'))[0]
+        except IndexError:
+            raise BuildError('No cover specified (metadata field relation.coverimage.url missing)')
+        if not cover_url:
+            raise BuildError('No cover specified (metadata field relation.coverimage.url empty)')
         if cover_url.startswith('file://'):
             cover_url = ctx.files_path + urllib.quote(cover_url[7:])
         try: