Add Event Series crashes on save when end date or start date isn't selected.

Thanks for this. I need to tighten up all validation on these recurrence types actually

Hi, I have fixed the issue and adding the patch for the same.

Thanks for the patch. I'll take a look at this soon.

Please review the new patch

Hey Siddhant and Naresh,

Thanks for the patches towards this issue. However, there is a bigger problem of field widget validation that needs to be addressed. I've attached a patch in which all of the special recurring events field widgets are responsible for their own validation.

The validation is more robust now because it checks individual fields and ensures they are completed as expected. I appreciate the work you put into this, however we need more validation than just checking the entire array is empty.

The patch also addresses some other issues which relate to validation for example checking that the consecutive recurring type is not generating too many instances, and also fixing the broken functionality with modifying date recurrence not triggering a prompt and diff table to approve those changes.

I also took the opportunity to use the StringTranslationTrait to update calls for `t()` to `$this->t()`

I found a ksm() I forgot to remove. This patch has that removed.

This has been merged and marked as fixed. Thanks all for the patches and issue.