Problem description: Previously before specifying a name for a new dashboard the breadcrumbs of this dashboard contained only a link to the list of dashboards:  

After implementation of ZBXNEXT-6291 breadcrumbs also contain the default dashboard name, even when the name of the dashboard is not defined yet:

Basically now this breadcrumb works inconsistently between 5.0 (and older) version and 5.2 (and younger) version.

Steps to reproduce:

1. Open the list of dashboards in Monitoring => Dashboard
2. Click on "Create dashboard" button

Result: in the opened new dashboard view breadcrumb already contains the default dashboard name ("New dashboard").
Expected: the breadcrumb should not contain the default dashboard name until the dashboard name is defined and the dashboard is saved.