Describe the bug
Whilst using the Unified_Power_rg model, User JamesD observed that trying to 'Copy params to Format' or 'Save Params to File' throws errors and does not work. The bug is easily to replicate.

15:23:15 - ERROR: Traceback (most recent call last):
  File "sas\qtgui\Perspectives\Fitting\FittingPerspective.py", line 120, in onExcelCopy
  File "sas\qtgui\Perspectives\Fitting\FittingWidget.py", line 3891, in onCopyToClipboard
  File "sas\qtgui\Perspectives\Fitting\FittingUtilities.py", line 806, in formatParametersExcel
IndexError: list index out of range
15:23:26 - ERROR: Traceback (most recent call last):
  File "sas\qtgui\Perspectives\Fitting\FittingPerspective.py", line 214, in onParamSave
  File "sas\qtgui\Perspectives\Fitting\FittingWidget.py", line 3896, in onCopyToClipboard
  File "sas\qtgui\Perspectives\Fitting\FittingUtilities.py", line 806, in formatParametersExcel
IndexError: list index out of range

To Reproduce
Run SasView and load up the Shape Independent > unified_power_Rg model
Compute the model
Attempt to Edit > Copy Params to Format/Save Params to File

Expected behavior
The model parameters should be exported. Though slightly different, this functionality works in 4.2.2

Workaround
Edit > Copy Params does work, but the format is not intended for the same use that Copy Params to Format/Save Params to File are

SasView version
Reproduced in 5.0.5, 5.0.4 & 5.0.3 so appears to be a general bug in 5.x

Operating system (please complete the following information):
x64/W10