Remove unnecessary spaces

Thanks to:

```bash
sed -i 's/^ *$//g' extract_noise.py
```

datasets/raise/extract_noise.py

@@ -56,13 +56,13 @@ def treatImage(imageFileName, computeExtremes = False):
             # RG
             # GB
             rawImageVisible = raw.raw_image_visible.copy()
-            
+
             redRawImageVisible = rawImageVisible[::2, ::2]
             greenRightRawImageVisible = rawImageVisible[::2, 1::2]
-            
+
             greenBottomRawImageVisible = rawImageVisible[1::2, ::2]
             blueRawImageVisible = rawImageVisible[1::2, 1::2]
-            
+
             # Actual color to estimate the PRNU with.
             colorRawImageVisible = greenBottomRawImageVisible
             if computeExtremes: