Moved condition to one line, removed empty dictionary check

bob/bio/video/preprocessor/Wrapper.py

@@ -120,9 +120,8 @@ class Wrapper(bob.bio.base.preprocessor.Preprocessor):
 
         for index, frame, _ in frames:
 
-            annots = None
             # if annotations are given, and if particular frame annotations are not missing we take them:
-            if annotations is not None and index in annotations.keys() and annotations[index]: annots = annotations[index]
+            annots = annotations[index] if annotations is not None and index in annotations else None
 
             # preprocess image (by default: detect a face)
             preprocessed = self.preprocessor(frame, annots)

bob/bio/video/test/test_preprocessor.py

@@ -73,9 +73,9 @@ def test_missing_annotations():
 
     preprocessed_video = preprocessor(video, annotations)
 
-    assert len(preprocessed_video) == 2
+    assert len(preprocessed_video) == 3
     assert preprocessed_video[0][1] == 3
-    assert [x[0] for x in preprocessed_video] == ['0', '3']
+    assert [x[0] for x in preprocessed_video] == ['0', '1', '3']
 
 
 def test_detect():