code: def test_report_parvalue_non_numeric(fitresult):
      """Verify that a non-numeric value is handled gracefully."""
      fitresult.params["center"].value = None
      fitresult.params["center"].stderr = None
      report = fitresult.fit_report()
      assert len(report) > 50
  
imports: import numpy
  import pytest
  import lmfit
  from lmfit import Minimizer, Parameters, ci_report, conf_interval, fit_report, report_ci, report_fit
  from lmfit.lineshapes import gaussian
  from lmfit.models import GaussianModel
  from lmfit.printfuncs import alphanumeric_sort, correl_table, fitreport_html_table, getfloat_attr, gformat
label_desc: Use image node_id 21 for calling a global function with example usage: test_report_parvalue_non_numeric(fitresult) without return types