Update janus_core/calculations/phonons.py

Co-authored-by: Elliott Kasoar <[email protected]>

Author: alinelena

janus_core/calculations/phonons.py

@@ -290,7 +290,7 @@ def __init__(
         self.enable_progress_bar = enable_progress_bar
 
         # Handle deprecation
-        if force_consts_to_hdf5:
+        if force_consts_to_hdf5 is not None:
             if hdf5:
                 raise ValueError(
                     """`force_consts_to_hdf5`: has replaced `hdf5`.