Be even more conservative on errors

This runs at startup of anything, so we should be extra sure to not
break anything, and lots of things can go wrong downloading files from
the internet

bookwyrm/apps.py

@@ -22,6 +22,8 @@ def download_file(url, destination):
         logger.error("Failed to download file %s", url)
     except OSError:
         logger.error("Couldn't open font file %s for writing", destination)
+    except:  # pylint: disable=bare-except
+        logger.exception("Unknown error in file download")
 
 
 class BookwyrmConfig(AppConfig):