Fix min/max_shore_distance param access in availability matrix calc (#2020)

Author: brynpickering

doc/release_notes.rst

@@ -9,6 +9,8 @@ Release Notes
 Upcoming Release
 ================
 
+* Fix `None` default config parameter from creating zero availability for offshore wind (#2019).
+
 * Remove snakemake's slurm plugin from windows installations (https://github.com/PyPSA/pypsa-eur/pull/2009).
 
 * Added Xpress solver configuration options (``xpress-default`` and ``xpress-gpu``) with barrier method settings optimized for large-scale linear programming problems.

scripts/determine_availability_matrix.py

@@ -145,11 +145,11 @@
             snakemake.input.gebco, codes=func, crs=4326, nodata=-1000, invert=True
         )
 
-    if "min_shore_distance" in params:
+    if params.get("min_shore_distance") is not None:
         buffer = params["min_shore_distance"]
         excluder.add_geometry(snakemake.input.country_shapes, buffer=buffer)
 
-    if "max_shore_distance" in params:
+    if params.get("max_shore_distance") is not None:
         buffer = params["max_shore_distance"]
         excluder.add_geometry(
             snakemake.input.country_shapes, buffer=buffer, invert=True