Model.make_params() sometimes ignores set a parameter with a prefix

[newville]

Description

This issue was shown in #892

A Minimal, Complete, and Verifiable example

from lmfit.models import GaussianModel

mod = GausssiaModel(prefix='g1_')

# this works
mod.make_params(amplitude=1, center=2000, sigma=20) 

# this fails
mod.make_params(g1_amplitude=1, g1_center=2000, g1_sigma=20) 
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/..../lmfit-py/lmfit/model.py", line 703, in make_params
    setpar(par, kwargs[basename])
KeyError: 'amplitude'

Note that if a composite model was created, the g1_amplitude variation would work and be required

Fit report:

Error message:

The error is shown in #892, but repeated here:

Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/..../lmfit-py/lmfit/model.py", line 703, in make_params
    setpar(par, kwargs[basename])
KeyError: 'amplitude'

Version information

Latest.

Link(s)

#892