Fix issue when creating only one World market

premise/__init__.py

@@ -4,7 +4,7 @@
     "clear_inventory_cache",
     "get_regions_definition",
 )
-__version__ = (2, 1, 1, "dev3")
+__version__ = (2, 1, 1, "dev4")
 
 
 from premise.new_database import NewDatabase

premise/external.py

@@ -1080,7 +1080,7 @@ def create_markets(self) -> None:
                         ]
 
                     # remove World region from regions
-                    if "World" in regions:
+                    if "World" in regions and len(regions) > 1:
                         regions.remove("World")
 
                     # Loop through regions

premise/external_data_validation.py

@@ -69,7 +69,18 @@ def flag_activities_to_adjust(
     :return: dataset with additional info on variables to adjust
     """
 
-    regions = scenario_data["production volume"].region.values.tolist()
+    if "production volume variable" not in dataset_vars:
+        regions = scenario_data["production volume"].region.values.tolist()
+    else:
+        data = scenario_data["production volume"].sel(
+                variables=dataset_vars["production volume variable"]
+            )
+        # fetch regions which do not contain nan data
+        regions = [
+            r for r in data.region.values.tolist()
+            if not np.isnan(data.sel(region=r).values).all()
+        ]
+
     if "except regions" in dataset_vars:
         regions = [r for r in regions if r not in dataset_vars["except regions"]]