Fixing the >no-coverage< failure of the outline layers.

Author: pacesm

eoxserver/services/mapserver/wms/layers/coverage_outlines_layer_factory.py

@@ -41,30 +41,30 @@ def _outline_geom(self, cov):
     def generate(self):
         layer = self._polygon_layer(self.group, filled=False, srid=4326)
 
-        for cov, cov_name in reversed(self.coverages):
-
-            # get part of the visible footprint
-            outline = self._outline_geom(cov)
-
-            # skip invisible outlines
-            if outline.empty:
-                continue
-
-            # generate feature
-            shape = ms.shapeObj.fromWKT(outline.wkt)
+        if len(self.coverages) > 0:
+            for cov, cov_name in reversed(self.coverages):
+
+                # get part of the visible footprint
+                outline = self._outline_geom(cov)
+
+                # skip invisible outlines
+                if outline.empty:
+                    continue
+
+                # generate feature
+                shape = ms.shapeObj.fromWKT(outline.wkt)
+                shape.initValues(1)
+                shape.setValue(0, cov_name)
+
+                # add feature to the group
+                layer.addFeature(shape)
+       
+        else: # add empty feature if there is no applicable coverage 
+            shape = ms.shapeObj()
             shape.initValues(1)
-            shape.setValue(0, cov_name)
-
-            # add feature to the group
+            shape.setValue(0, "__empty__")
             layer.addFeature(shape)
 
-# TODO: run the test
-#        # Dummy feature, or else empty groups will produce errors
-#        shape = shapeObj()
-#        shape.initValues(1)
-#        shape.setValue(0, "dummy")
-#        layer.addFeature(shape)
-
         yield layer, None, ()