Small fix to raise an exception when no model was found instead of failing later with TypeError: 'int' object is not subscriptable.

sbb_binarize/sbb_binarize.py

@@ -34,6 +34,8 @@ class SbbBinarizer:
         self.start_new_session()
 
         self.model_files = glob('%s/*.h5' % self.model_dir)
+        if not self.model_files:
+            raise ValueError(f"No models found in {self.model_dir}")
         
         self.models = []
         for model_file in self.model_files: