Bugfix search with wrong custom column configured

cps/metadata_provider/scholar.py

@@ -49,6 +49,8 @@ class scholar(Metadata):
                 tokens = [quote(t.encode("utf-8")) for t in title_tokens]
                 query = " ".join(tokens)
             try:
+                scholarly.set_timeout(20)
+                scholarly.set_retries(2)
                 scholar_gen = itertools.islice(scholarly.search_pubs(query), 10)
             except Exception as e:
                 log.warning(e)

cps/search.py

@@ -134,6 +134,9 @@ def adv_search_read_status(read_status):
                 db_filter = coalesce(db.cc_classes[config.config_read_column].value, False) != True
         except (KeyError, AttributeError, IndexError):
             log.error("Custom Column No.{} does not exist in calibre database".format(config.config_read_column))
+            flash(_("Custom Column No.%(column)d does not exist in calibre database",
+                    column=config.config_read_column),
+                  category="error")
             return true()
     return db_filter