nodata logic change

app/api/tiler.py

@@ -168,8 +168,10 @@ class Metadata(TaskNestedView):
                 if has_alpha_band(src):
                     band_count -= 1
 
+                nodata = None
                 # Workaround for https://github.com/OpenDroneMap/WebODM/issues/894
-                nodata = 0
+                if tile_type == 'orthophoto':
+                    nodata = 0
 
                 info = main.metadata(src, pmin=pmin, pmax=pmax, histogram_bins=255, histogram_range=hrange, expr=expr, nodata=nodata)
         except IndexError as e:
@@ -345,7 +347,7 @@ class Tiles(TaskNestedView):
                     indexes = non_alpha_indexes(src)
             
             # Workaround for https://github.com/OpenDroneMap/WebODM/issues/894
-            if nodata is None:
+            if nodata is None and tile_type =='orthophoto':
                 nodata = 0
 
         resampling="nearest"