Interpolate Not Functioning

Summary:

Steps to reproduce:

open Inkscape
Create 2 circles one on thee left one on the right
Fill the left one red or any color fill the right one green
Select both circles
Go to extensions/Generate from Path/ Interpolate Exponent 0.0 Interpolation steps 7 Interpolation method 1 Duplicate Endpoints selected Interpolate Style selected Click Live Preview Click apply

Nothing happened

...

I should have seen 7 circles ranging from left to right between the 2 circles I already had, totaling 9 circles.

...

Sample attachments:

Un necessary to attach but here it is anyway

Version Info:

- Inkscape Version: 1.1-dev (04862db, 2020-09-22) inkscape-1.1-dev_2020-09-22_04862db-x64 and 1.1-dev (04862db, 2020-09-22) inkscape-1.1-dev_2020-09-22_04862db-x86 tested on both
- Operating System: Windows 10 Home 19041.508
- Operating System version: ...19041.508 Windows Feature Experience Pack 120.2212.31.0
```Tested on different computer same problem

On other computer I retested using version 1.0.1 (3bc2e813f5, 2020-09-07)
And resulted in errors

interp.py:115: SyntaxWarning: "is" with a literal. Did you mean "=="?
  if strokestyle is 'color':
interp.py:125: SyntaxWarning: "is" with a literal. Did you mean "=="?
  if fillstyle is 'color':

These errors are what caused me to use the latest dev version in the first place. So your latest dev version removed the errors but also removed functionality.

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