[INP-1381] Create special template for fatal error page - In-Portal Issue Tracker

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Change Log Group:
Added
Change Log Message:
In case, when a Fatal Error/Exception happens during page generation a nice error page will be displayed back to user.
Story Points:
2
Copy Issue Key:
Patch Instructions:
Patches must be submitted through Phabricator.
- To submit patch via Command Line use Patches Workflow (via Arcanist) tutorial
- To submit patch via Web Interface use Patches Workflow (via Web Interface) tutorial

Plan:

rename "ErrorTemplate" system setting to "NotFoundErrorTemplate" to avoid confusion - 0.3h
create new "FatalErrorTemplate" that will have "error_fatal" value by default - 0.2h
create "error_fatal" template in Front-End theme with most basic tags (the more static the better) - we can start with just showing "Opps, something went wrong ..." text with "default_design.tpl" - 1h
create "error_fatal" template in Admin Console (similar to "no_permission") - 0.5h
when Catchable Fatal Error is discovered and we're not in Debug Mode, then: - 1h
- store error message text in session
- redirect to that template (url would be /error_fatal.html)
- admin's template version will display error text from session, while Front-End template version won't
Dmitry suggested placing "Back" link/button on that template so user can go back where he hit the fatal error in case if it is fixed at some point - 0.5h

is blocked by

INP-1401 Don't use "die" in Debugger

implemented in

[Request, 290 lines] D3 INP-1381 - Create special template for fatal error page