diff app remove comparison bug

[Jhsmit]

File "C:\Users\jhs\Programming\pyhdx_stable\pyhdx\panel\controllers.py", line 370, in
remove_comparison = param.Action(lambda self: self._action_remove_comparison(),
File "C:\Users\jhs\Programming\pyhdx_stable\pyhdx\panel\controllers.py", line 444, in _action_remove_comparison
for comparison in self.comparison_list:
TypeError: 'NoneType' object is not iterable

[Jhsmit]

diff is app is outdated, functionality now part of main app