Merge pull request #1540 from davemfish/bugfix/UNA-1539-undefined-nodata

Nature Access, check for `None` nodata value

HISTORY.rst

@@ -88,6 +88,9 @@ Unreleased Changes
     * Fixed an issue where certain nodata values were not being handled
       correctly, leading to pixel values of +/- infinity in the urban nature
       balance output raster.  https://github.com/natcap/invest/issues/1519
+    * Fixed an issue where an LULC raster without a nodata value would
+      always raise in exception during reclassification.
+      https://github.com/natcap/invest/issues/1539
 * SDR
     * Fixed an issue encountered in the sediment deposition function where
       rasters with more than 2^32 pixels would raise a cryptic error relating

src/natcap/invest/urban_nature_access.py

@@ -1854,8 +1854,10 @@ def _reclassify_urban_nature_area(
             urban_nature_area = squared_pixel_area * urban_nature_proportion
         urban_nature_area_map[lucode] = urban_nature_area
 
-    lulc_raster_info = pygeoprocessing.get_raster_info(lulc_raster_path)
-    urban_nature_area_map[lulc_raster_info['nodata'][0]] = FLOAT32_NODATA
+    lulc_raster_nodata = pygeoprocessing.get_raster_info(
+        lulc_raster_path)['nodata'][0]
+    if lulc_raster_nodata is not None:
+        urban_nature_area_map[lulc_raster_nodata] = FLOAT32_NODATA
 
     utils.reclassify_raster(
         raster_path_band=(lulc_raster_path, 1),