Root cause of an error is not displayed when using save

In case of problem when saving, using save&continue button will always display properly the reason of the save failure in the notification, while using the save & view button will always only display "Server error" for the reason of the save failure which is not helping at all.

Reproduction steps:

• Create a page with a very long title (> 800 characters)
• Try to save it using save & continue
• Try to save it using save & view

Expected result:

• In both case the notification should display an exception reason

Obtained result:

• in case of save & continue the notification displays the exception reason
• in case of save & view the notification displays "server error"