I diced some images and then want to extract spectra the spectra from the dices. Because of how I diced the images, there are now dices that have no pixel information. Instead of manually removing those, I want the foreach loop to skip the ones with no pixels. When running this code:

1 foreach file, files do begin
2 raster1 = e.OpenRaster(file)
3 ;Define ROI with Threshold
4 roi = ENVIROI()
5 roi.AddThreshold, raster1, 182, min_value=0, max_value=1
6
7 pixelData = raster1.GetData(ROI=roi)
8 mean = Total(pixelData,1) / roi.PixelCount(raster1)
9
10 fname = SPECTRAoutputdir + path_sep() + file_basename(file, '.dat') + '_Diced_Spectra.txt'
11
12 openw,1,fname,width=1
13 printf,1,mean
14 close,1
15
16 endforeach

I get this error at Line 7 "pixelData = raster1.GetData(ROI=roi)":

"The EnviRoi does not contain any pixels for this raster."

Is there an ELSE statement or some way to skip those with no pixels? If no data then proceed? Something? Trying to avoid manually deleting all the images with no pixels.

Thanks.