FIX: plot formula

[maxcapodi78]

Reverted behaviour of get_report_plotter to plot real data when no formula is passed.

Description

Please provide a brief description of the changes made in this pull request.

Issue linked

#5559

Checklist

• I have tested my changes locally.
• I have added necessary documentation or updated existing documentation.
• I have followed the coding style guidelines of this project.
• I have added appropriate tests (unit, integration, system).
• I have reviewed my changes before submitting this pull request.
• I have linked the issue or issues that are solved by the PR if any.
• I have agreed with the Contributor License Agreement (CLA).

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 85.30%. Comparing base (7ba1650) to head (ee0c2cf).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #5560   +/-   ##
=======================================
  Coverage   85.29%   85.30%           
=======================================
  Files         151      151           
  Lines       60753    60751    -2     
=======================================
  Hits        51822    51822           
+ Misses       8931     8929    -2     

[Samuelopez-ansys]

LGTM