respect blacklist

src/snuffling.py

@@ -253,10 +253,13 @@ def snuffle(config):
         s.setup()
         win.pile_viewer.viewer.add_snuffling(s, reloaded=True)
         win.pile_viewer.viewer.add_blacklist_pattern('*.SMAX.i.*')
+        for bl in _lassie_config.blacklist:
+            win.pile_viewer.viewer.add_blacklist_pattern('%s.*' % bl)
 
-        s.detections = detections_to_event_markers(
-            _lassie_config.detections_path)
-        s.add_markers(s.detections)
+        if os.path.exists(_lassie_config.detections_path):
+            s.detections = detections_to_event_markers(
+                _lassie_config.detections_path)
+            s.add_markers(s.detections)
 
     receivers = config.get_receivers()
     stations = set()