Warnings on boot if gonio axes values are not set

[GDYendell]

If they are set then it works fine because the fetch returns a float.

Failed to get detector/api/1.8.0/config/phi_increment:
TypeError float() argument must be a string or a real number, not 'NoneType'
Failed to get detector/api/1.8.0/config/kappa_start:
TypeError float() argument must be a string or a real number, not 'NoneType'
Failed to get detector/api/1.8.0/config/phi_start:
TypeError float() argument must be a string or a real number, not 'NoneType'
Failed to get detector/api/1.8.0/config/chi_increment:
TypeError float() argument must be a string or a real number, not 'NoneType'
Failed to get detector/api/1.8.0/config/chi_start:
TypeError float() argument must be a string or a real number, not 'NoneType'
Failed to get detector/api/1.8.0/config/kappa_increment:
TypeError float() argument must be a string or a real number, not 'NoneType'
Failed to get detector/api/1.8.0/config/omega_start:
TypeError float() argument must be a string or a real number, not 'NoneType'
Failed to get detector/api/1.8.0/config/omega_increment:
TypeError float() argument must be a string or a real number, not 'NoneType'
Failed to get detector/api/1.8.0/config/two_theta_increment:
TypeError float() argument must be a string or a real number, not 'NoneType'
Failed to get detector/api/1.8.0/config/two_theta_start:
TypeError float() argument must be a string or a real number, not 'NoneType'

Check if this happens with a real detector. If the real detector returns None, then we need to handle it correctly. If it is just the simulator then that should be fixed.

Steps To Reproduce

With sim

1. Start tickit simulator
2. Start IOC

or with real detector

1. Re-initialise the detector
2. Check what values these parameters have with curl
   • e.g. curl -v http://ixx-eiger01/detector/api/1.8.0/config/phi_start
3. Start IOC

Acceptance Criteria

• No warnings on boot

[GDYendell]

I don't seem to be able to reproduce this with the sim currently...

[GDYendell]

Got this deploying to i03:

❯ ec logs bl03i-ea-eiger-02
INFO: PVXS QSRV2 is loaded, permitted, and ENABLED.
Starting iocInit
############################################################################
## EPICS 7.0.7.1-DEV
## Rev. 7.0.7.99.1.1
## Rev. Date 7.0.7.99.1.1
############################################################################
Failed to get detector/api/1.8.0/config/total_flux:
TypeError float() argument must be a string or a real number, not 'NoneType'
iocRun: All initialization complete
Python 3.11.10 (main, Nov 12 2024, 02:25:24) [GCC 12.2.0] on linux
Type "help", "copyright", "credits" or "license" for more information.
(InteractiveConsole)
❯ curl -v http://i03-eiger01/detector/api/1.8.0/config/total_flux
*   Trying 172.23.103.210...
* TCP_NODELAY set
* Connected to i03-eiger01 (172.23.103.210) port 80 (#0)
> GET /detector/api/1.8.0/config/total_flux HTTP/1.1
> Host: i03-eiger01
> User-Agent: curl/7.61.1
> Accept: */*
>
< HTTP/1.1 200 OK
< content-type: application/json; charset=utf-8
< date: Tue, 11 Feb 2025 09:52:53 GMT
< content-length: 55
<
{"access_mode":"rw","value":null,"value_type":"float"}

so, we do need to handle this.