Make grt::have_routes return 0/1 silently

[oharboe]

Description

When scripting, it is useful to check if an operation that needs global routing should be skipped or not using grt::have_routes.

However, grt::have_routes prints warnings and errors.

[WARNING GRT-0097] No global routing found for nets. 0

Or if run with make gui_floorplan

>>> grt::have_routes
[ERROR GRT-0010] Instance ctrl.state.out\[0\]$_DFF_P_ is not placed.
[ERROR GUI-0070] GRT-0010

Since these errors/warnings are logged, catch is no help:

>>> catch {grt::have_routes} error
[ERROR GRT-0010] Instance ctrl.state.out\[0\]$_DFF_P_ is not placed.
1

Suggested Solution

grt::have_routes should silently return 0/1, but it can returns warnings and errors.

Additional Context

No response

[maliberty]

grt::have_routes should silently return 0/1, but it can returns warnings and errors.

I don't see how it can be silent, returning 0/1, and also return errors/warnings. I think we can just drop the error.

[oharboe]

@maliberty @luis201420 I made a fleeting vain attempt at removing the warning #6305