mod_assign: Grading table incorrect type of perpage preference

The MDL-43395 item, introduced a check to ensure the limit param is an integer.

The grading table uses a perpage preference stored in the DB which is retrieved as a string. When the user selects the 'All' option for the 'Assignments per page' settings a string '-1' is used rather than an int -1 which causes the debugging message from MDL-43395 to be displayed.

STEPS TO REPLICATE

• view the list of submissions for a mod_assign activity
• select the 'All' option for the 'Assignments per page' setting

WHAT IS EXPECTED:

• all submissions are listed in the table without debug output

WHAT ACTUALLY HAPPENS

• all submissions are listed in the table with debug output