FIX: make sure spercent is defined

[reneeotten]

Description

This fixes the issue reported in #768 regarding the undefined spercent variable.

Type of Changes

• Bug fix
• New feature
• Refactoring / maintenance
• Documentation / examples

Tested on

Python: 3.9.9 (main, Nov 16 2021, 07:21:43)
[Clang 11.0.3 (clang-1103.0.32.62)]

lmfit: 1.0.3.post6+g1b9a88f, scipy: 1.7.3, numpy: 1.21.4, asteval: 0.9.25, uncertainties: 3.1.6

Verification

Have you

• included docstrings that follow PEP 257?
• referenced existing Issue and/or provided relevant link to mailing list?
• verified that existing tests pass locally?
• verified that the documentation builds locally?
• squashed/minimized your commits and written descriptive commit messages?
• added or updated existing tests to cover the changes?
• updated the documentation and/or added an entry to the release notes (doc/whatsnew.rst)?
• added an example?

[codecov]

Codecov Report

Merging #770 (47602d3) into master (1b9a88f) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master     #770   +/-   ##
=======================================
  Coverage   93.75%   93.75%           
=======================================
  Files          10       10           
  Lines        3410     3411    +1     
=======================================
+ Hits         3197     3198    +1     
  Misses        213      213           

Impacted Files	Coverage Δ
lmfit/printfuncs.py	99.58% <100.00%> (+<0.01%)	⬆️

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[newville]

@reneeotten Thanks! I say we merge, but I guess we should wait until the tests pass.

[newville]

merging!