make extent order when calculating global_extent more intuitive Open-EO#358

Author: JeroenVerstraelen

openeo_driver/ProcessGraphDeserializer.py

@@ -630,10 +630,10 @@ def _extract_load_parameters(env: EvalEnv, source_id: tuple) -> LoadParameters:
 
         for collection_id, constraint in source_constraints:
             extent = None
-            if "weak_spatial_extent" in constraint:
-                extent = constraint["weak_spatial_extent"]
             if "spatial_extent" in constraint:
                 extent = constraint["spatial_extent"]
+            elif "weak_spatial_extent" in constraint:
+                extent = constraint["weak_spatial_extent"]
             if extent is not None:
                 collection_crs = _collection_crs(collection_id[1][0], env)
                 crs = constraint.get("resample", {}).get("target_crs", collection_crs) or collection_crs