fixes running kpi queries if no rl_params exist

[codecov[bot]]

Codecov Report

All modified lines are covered by tests :white_check_mark:

Comparison is base (fa9e9b3) 81.99% compared to head (4b397a6) 80.93%.

:exclamation: Current head 4b397a6 differs from pull request most recent head 4a2432f. Consider uploading reports for the commit 4a2432f to get more accurate results

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #210 +/- ## ========================================== - Coverage 81.99% 80.93% -1.07% ========================================== Files 39 40 +1 Lines 4054 4059 +5 ========================================== - Hits 3324 3285 -39 - Misses 730 774 +44 ``` | [Flag](https://app.codecov.io/gh/assume-framework/assume/pull/210/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=assume-framework) | Coverage Δ | | |---|---|---| | [pytest](https://app.codecov.io/gh/assume-framework/assume/pull/210/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=assume-framework) | `80.93% <100.00%> (-1.07%)` | :arrow_down: | 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=assume-framework#carryforward-flags-in-the-pull-request-comment) to find out more. | [Files](https://app.codecov.io/gh/assume-framework/assume/pull/210?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=assume-framework) | Coverage Δ | | |---|---|---| | [assume/common/outputs.py](https://app.codecov.io/gh/assume-framework/assume/pull/210?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=assume-framework#diff-YXNzdW1lL2NvbW1vbi9vdXRwdXRzLnB5) | `81.34% <100.00%> (+0.32%)` | :arrow_up: | ... and [12 files with indirect coverage changes](https://app.codecov.io/gh/assume-framework/assume/pull/210/indirect-changes?src=pr&el=tree-more&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=assume-framework)

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