Qhc 588 bug `get_parameter` does not work with QM platform

[jordivallsq]

Fixed the bug on QM that crashed the get_parameter function and changed the QM get_parameter to work without connection to the instrument

[linear[bot]]

QHC-588 [BUG] Get_parameter does not work with QM platform

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 98.43750% with 1 line in your changes missing coverage. Please review.

Project coverage is 94.96%. Comparing base (4975900) to head (fe15bc8).

Files	Patch %	Lines
src/qililab/system_control/system_control.py	66.66%	1 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #751 +/- ## ======================================= Coverage 94.96% 94.96% ======================================= Files 263 263 Lines 8596 8628 +32 ======================================= + Hits 8163 8194 +31 - Misses 433 434 +1 ``` | [Flag](https://app.codecov.io/gh/qilimanjaro-tech/qililab/pull/751/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=qilimanjaro-tech) | Coverage Δ | | |---|---|---| | [unittests](https://app.codecov.io/gh/qilimanjaro-tech/qililab/pull/751/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=qilimanjaro-tech) | `94.96% <98.43%> (+<0.01%)` | :arrow_up: | Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=qilimanjaro-tech#carryforward-flags-in-the-pull-request-comment) to find out more.

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[GuillermoAbadLopez]

Did this commit: https://github.com/qilimanjaro-tech/qililab/pull/751/commits/916d5d7bb22cdb9f2ebbbbd7a799637550c511d1, adding:

• _config_existsbool/flag attribute, taht turns True when we initial_setup and the _config is created
• Make that we don't generate a _config in the get_parameter(), but only where its supposed to happen, in the initial_setup, creating a temporary dictionary if it doesn't exist beforehand👍 (This code can be changed by getting parameters from the settings instead)

[GuillermoAbadLopez]

@jordivallsq appart than the still open comment, this one I think its ready to go!

Check the last changes, when you can, please! 🙏 (tomorrow I'll address/resolve my still opened silly comments 👍 )

[jordivallsq]

Added @GuillermoAbadLopez changes on set_parameter