Fixed empty insert query

Fix for situation when len(values) is 0. Before fix it will result with
malformed insert query with empty values vector.

hive/indexer/posts.py

@@ -238,7 +238,7 @@ class Posts:
                 DB.query(actual_query)
                 values.clear()
 
-        if len(values) >= 0:
+        if len(values) > 0:
             values_str = ','.join(values)
             actual_query = sql.format(values_str)
             DB.query(actual_query)