ignore missing files when importing

nonstop/management/commands/create_tracks_from_nonstop.py

 import mutagen
+import os
 
 from django.core.management.base import BaseCommand, CommandError
 
@@ -18,6 +19,10 @@ class Command(BaseCommand):
                 print filepath[len(LOCAL_BASE_PATH):]
             if 'SPOTS/' in filepath:
                 continue
+            if not os.path.exists(filepath):
+                if self.verbose:
+                    print 'missing file:', filepath[len(LOCAL_BASE_PATH):]
+                continue
             metadata = mutagen.File(filepath, easy=True)
             if not metadata or not metadata.get('artist') or not metadata.get('title'):
                 if self.verbose: