More fault tolerant server image resize

app/models/task.py

@@ -116,7 +116,7 @@ def resize_image(image_path, resize_to, done=None):
         os.rename(resized_image_path, image_path)
 
         logger.info("Resized {} to {}x{}".format(image_path, resized_width, resized_height))
-    except IOError as e:
+    except (IOError, ValueError) as e:
         logger.warning("Cannot resize {}: {}.".format(image_path, str(e)))
         if done is not None:
             done()