Be more defensive when managing entities in the UI if the `tenantId` is removed or invalid

[robotdan]

Be more defensive when managing entities in the UI if the tenantId is removed or invalid

Description

On the manage entity page the tenantId is in the query string. If you remove it, or mangle it accidentally by copy/paste we aren't validating this parameter prior to page render. This means FreeMarker will puke and create an event log with the stack trace.

==> tenantId  [in template "templates/admin/entity/manage.ftl" at line 50, column 121]

We could optionally kick you back to admin/entity/ if this parameter is null or invalid. This would provide a better user experience.

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