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<https://github.com/The-OpenROAD-Project/OpenLane/issues/1599|#1599 FP_PDN_MACRO_HOOKS: No warning/error if instance does not exist>
Issue created by <https://github.com/mole99|mole99>
*Description*

Currently, no warning or error is issued if an instance specified in `FP_PDN_MACRO_HOOKS` does not exist.

For example, with the following entries for <https://github.com/efabless/caravel_user_project|caravel_user_project> the flow will complete successfully, even though `aaaa` does not exist as an instance.

```
"FP_PDN_MACRO_HOOKS": [
    "mprj vccd1 vssd1 vccd1 vssd1,",
    "aaaa vccd1 vssd1 vccd1 vssd1"
],
```

In this obvious case, the wrong entry can be easily spotted. But with subtle typos, it may take a while to find the actual problem.

*Proposal*

Check if the modules specified in `FP_PDN_MACRO_HOOKS` actually exist. If not, issue a warning or an error.
<https://github.com/The-OpenROAD-Project/OpenLane|The-OpenROAD-Project/OpenLane>