Required client side validation on sending BIRT report by mail

Steps to regenerate:

• Goto BIRT --> Send any format through Mail
• Leave 'Birt Report Location' and 'Attachment Name' fields empty and enter all the other fields detail
• Click on send button

Actual:
Server side error is thrown

The Following Errors Occurred:
The following required parameter is missing: [sendBirtMail.birtReportLocation]
The following required parameter is missing: [sendBirtMail.attachmentName]

Actual:
Client-side validation should be applied for 'Birt Report Location' and 'Attachment Name' fields