Add hasattr checks to prevent faulty __del__.

etiquette/photodb.py

@@ -706,7 +706,13 @@ class PDBSQLMixin:
         self.savepoints = []
 
     def close(self):
+        # Wrapped in hasattr because if the object fails __init__, Python will
+        # still call __del__ and thus close(), even though the attributes
+        # we're trying to clean up never got set.
+        if hasattr(self, 'sql'):
             self.sql.close()
+
+        if hasattr(self, 'ephemeral'):
             if self.ephemeral:
                 self.ephemeral_directory.cleanup()