Fix Database.count() method

lib/nntp/tiny/db.py

@@ -118,11 +118,13 @@ class Database():
         return self.query(table, values).fetchone()
 
     def count(self, table, values: dict=dict()):
-        sql = "select count(id) as num from {table.name}"
+        sql = f"select count(id) as num from {table.name}"
 
         if len(values) > 0:
+            sql += " where "
             sql += " and ".join([f"{k} = ?" for k in values])
 
-        result = self.db.execute(sql, values.values())
+        cr  = self.db.execute(sql, list(values.values()))
+        row = cr.fetchone()
 
-        return result[0][0]
+        return row[0]