Re-running a simulation from a ParamSpace meta config fails
When trying to `utopya run MyModel path/to/some/older/meta_cfg.yml`, this fails with a stupid error.
#### Steps to reproduce
1. Perform a run
1. Use the created `meta_cfg.yml` as input for another run of the same model
#### What is the current _bug_ behaviour?
Fails when trying to iterate `parameter_space` entry, assuming it is not a `ParamSpace` object.
#### What is the expected _correct_ behaviour?
Succeeds.
#### Ideas how to fix this?
Distinguish between dicts and `ParamSpace` objects for `parameter_space` key of the meta config.
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