Update SDS_download.py

fix for issue #356

coastsat/SDS_download.py

@@ -165,7 +165,10 @@ def retrieve_images(inputs):
                 else: 
                     acc_georef = -1
                 # add additional metadata for Sharon's Sniffer ['PASSED' or 'FAILED']
-                im_quality.append(im_meta['properties']['RADIOMETRIC_QUALITY'])
+                flag_names = ['RADIOMETRIC_QUALITY', 'RADIOMETRIC_QUALITY_FLAG']
+                for key in flag_names: 
+                    if key in im_meta['properties'].keys(): break
+                im_quality.append(im_meta['properties'][key])
             georef_accs.append(acc_georef)
 
             # download the images as .tif files