new symbols are not saving
[2021-10-01 17-00-40] PHP Notice: Trying to access array offset on value of type null in /home/charles/workspace/alembiq/bistro/htdocs/symbols.php:23 @ http://bistro/symbols.php
[2021-10-01 17-00-40] PHP Notice: Undefined index: filter in /home/charles/workspace/alembiq/bistro/htdocs/symbols.php:96 @ http://bistro/symbols.php
[2021-10-01 17-00-40] PHP Warning: sizeof(): Parameter must be an array or an object that implements Countable in /home/charles/workspace/alembiq/bistro/htdocs/symbols.php:96 @ http://bistro/symbols.php
[2021-10-01 17-00-40] PHP Warning: mysqli_num_rows() expects parameter 1 to be mysqli_result, bool given in /home/charles/workspace/alembiq/bistro/htdocs/lib/filters.php:87 @ http://bistro/symbols.php
[2021-10-01 17-00-40] PHP Warning: mysqli_num_rows() expects parameter 1 to be mysqli_result, bool given in /home/charles/workspace/alembiq/bistro/htdocs/symbols.php:124 @ http://bistro/symbols.php