Revision 1844031

Render uninitialized min and max values in Summary Report as `#N/A`

In the Summary Report min and max values are initialized with
`Long#MAX_VALUE` and `Long#MIN_VALUE` to work easily with them.

Those initial values are looking weird in the rendered view.
Hide them by replacing the extrema by the text `#N/A`.

Closes #407 on github
Bugzilla Id: 62822