regularizepsf
                                
                                
                                
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                        Create warning when building the model if a patch is empty
As mentioned in #93 , the model gets zeroed out or set to NaNs so that when it is applied it produces blank regions of the corrected image.
- [ ] Warn a user who creates a model if insufficient stars were available in a region.
 - [ ] Warn a user who uses a model with insufficient stars that a region will be blank