When adding a dataquery, SQL errors can be generated

[yingbaiibm]

To Reproduce
Steps to reproduce the behavior:

1. Go to Data Collection - Data Query page
2. Add a Data Query, error exist in log

2019/04/02 14:12:39 - ERROR PHP NOTICE: Undefined variable: previous_input_id in file: /var/www/html/cacti/data_queries.php on line: 143
2019/04/02 14:12:39 - CMDPHP PHP ERROR NOTICE Backtrace: (/var/www/html/cacti/data_queries.php[39]:form_save(), /var/www/html/cacti/data_queries.php[143]:CactiErrorHandler())

Desktop (please complete the following information):

• OS: [e.g. iOS] rhel73 x64
• Browser [e.g. chrome, safari] FF
• Version [e.g. 22] cacti1.2.2

[cigamit]

Good catch. Resolved.