Check shapefile validity

qgis/export.bat

@@ -1,4 +1,4 @@
-set PYTHON="C:\Program Files\QGIS 3.20.3\bin\python-qgis.bat"
+set PYTHON="C:\Program Files\QGIS 3.22.5\bin\python-qgis-ltr.bat"
 
 %PYTHON% export.py
 

qgis/export.py

@@ -61,6 +61,13 @@ def unique_attributes(layer):
 map_layers = project.mapLayers().items()
 layers = [v for k, v in map_layers if re.search(r'\d{4}', v.name())]
 
+try:
+    next(layers[0].getFeatures())
+except StopIteration:
+    msg = 'No hazard lines found. Check shapefile data.'
+    raise ValueError(msg)
+
+
 # Get all EP values and profile types from first hazard line layer
 eps, types, years = unique_attributes(layers[0])