Brief summary of changes

In the Create Timepoint module, if there was a PHP error upon submission, the entered data would not save without any error message. This adds an error swal if a PHP error occurs

Testing instructions (if applicable)

1. Revert the changes made in this PR to cause a PHP error
2. In the Create Timepoint module of any candidate, create a new valid visit
3. Submit and verify that the error swal appears
4. Restore the changes in the create_timepoint class (such that there are no PHP errors) and check that new visits can be created

Link(s) to related issue(s)

• Resolves [create_timepoint] Success swal appears even on failure #9358