simpler fail if logo is not found

modoboa/pdfcredentials/documents.py

@@ -62,7 +62,9 @@ def credentials(account, password):
     buff = BytesIO()
     doc = SimpleDocTemplate(buff, pagesize=A4)
     story = []
-    story.append(resized_image(lib.get_document_logo(), 8*cm))
+    logo = lib.get_document_logo()
+    if logo is not None:
+        story.append(resized_image(logo, 8*cm))
     story.append(Spacer(1, 1 * cm))
     story.append(Paragraph(conf["title"], styles["Title"]))
     story.append(Spacer(1, 1 * cm))

modoboa/pdfcredentials/lib.py

@@ -96,6 +96,9 @@ def get_document_logo():
         logo = settings.MODOBOA_CUSTOM_LOGO
         logo = os.path.join(settings.MEDIA_ROOT, os.path.basename(logo))
     except AttributeError:
-        logo = os.path.join(settings.STATIC_ROOT, "css/modoboa.png")
+        try:
+            logo = os.path.join(settings.STATIC_ROOT, "css/modoboa.png")
+        except OSError:
+            return None
     finally:
         return logo