Defining AOISceneMissing as a AOIScen and an Exception.

1 files changed, 11 insertions, 3 deletions

diff --git a/src/argaze/AreaOfInterest/AOIFeatures.py b/src/argaze/AreaOfInterest/AOIFeatures.py
index 8bf546f..14d8166 100644
--- a/src/argaze/AreaOfInterest/AOIFeatures.py
+++ b/src/argaze/AreaOfInterest/AOIFeatures.py
@@ -199,16 +199,24 @@ class AOIScene():
 
         return scene_copy
 
+class AOISceneMissing(AOIScene, Exception):
+    """Exception to raise when aoi scene is missing."""
+
+    def __init__(self, message):
+
+        super(Exception, self).__init__(message)
+
+        self.dimension = 0
+        self.areas = {}
+
 class TimeStampedAOIScenes(DataStructures.TimeStampedBuffer):
     """Define timestamped buffer to store AOI scenes in time."""
 
     def __setitem__(self, key, value):
         """Force value to inherit from AOIScene."""
+
         if type(value).__bases__[0] != AOIScene:
             raise ValueError(f'value must inherit from AOIScene')
 
         super().__setitem__(key, value)
 
-class AOISceneMissing(Exception):
-    """Exception to raise when aoi scene can't be processed."""
-    pass