snuffling: handle markerless ifcs

src/snuffling.py

@@ -284,6 +284,8 @@ def snuffle(config):
                 markers_path_extra = _ifc.picks_path
             elif isinstance(_ifc, ifc.TemplateMatchingIFC):
                 markers_path_extra = _ifc.template_markers_path
+            else:
+                continue
 
             if os.path.exists(markers_path_extra):
                 s.add_markers(pmarker.load_markers(markers_path_extra))