Robustify extract_parameters

nabu/resources/utils.py

@@ -94,6 +94,8 @@ def extract_parameters(params_str, sep=";"):
     >>> extract_parameters("window_width=None; median_filt_shape=(3,3); padding_mode='wrap'")
     ... {'window_width': None, 'median_filt_shape': (3, 3), 'padding_mode': 'wrap'}
     """
+    if params_str in ("", None):
+        return {}
     params_list = params_str.strip(sep).split(sep)
     res = {}
     for param_str in params_list: