Webform in block allowing clicking on send button and redirecting to page view, without validation the fields even when they are empty
This is because you somehow missed making the E-mail field mandatory.
You can do so by following the steps given below:  


Edit the existing webform content at : yourhost.com/admin/content and selecting edit for your webform.
Click the "Webform" tab, and check the "MANDATORY" option for the required field.
Click "Save". Thats it!