Fix missing warning about empty layers (#54)

This was accidentally removed from the GUI when logic was added
to omit it from the usage reports

felt/core/map_uploader.py

@@ -163,11 +163,11 @@ def _build_unsupported_layer_details(self,
         unsupported_layer_names = set()
         for layer in layers:
             support, reason = LayerExporter.can_export_layer(layer)
+            self.unsupported_layers.append((layer.name(), reason))
             if not support.should_report():
                 continue
 
             unsupported_layer_names.add(layer.name())
-            self.unsupported_layers.append((layer.name(), reason))
             if layer.type() == QgsMapLayer.PluginLayer:
                 id_string = layer.pluginLayerType()
             else: