refactor exceptions in get_size method

sigal/gallery.py

@@ -171,21 +171,11 @@ class Image(Media):
 
     @cached_property
     def size(self):
-        try:
-            return get_size(self.dst_path)
-        except (IOError, IndexError, TypeError, AttributeError):
-            self.logger.warning(u'Could not read size %s',
-                                self.dst_path)
-            return None
+        return get_size(self.dst_path)
 
     @cached_property
     def thumb_size(self):
-        try:
-            return get_size(self.thumb_path)
-        except (IOError, IndexError, TypeError, AttributeError):
-            self.logger.warning(u'Could not read size %s',
-                                self.thumb_path)
-            return None            
+        return get_size(self.thumb_path)
 
 class Video(Media):
     """Gather all informations on a video file."""

sigal/image.py

@@ -166,8 +166,8 @@ def get_size(file_path):
     logger = logging.getLogger(__name__)
     try:
         im = PILImage.open(file_path)
-    except:
-        logger.error("Failed to open %s", file_path)
+    except (IOError, IndexError, TypeError, AttributeError) as e :
+        logger.error("Could not read size of %s due to %r", file_path, e)
     else:
         width,height = im.size
         return {