entities: fix for not-hashable value

Co-Authored-by: Bertrand Zuchuat <[email protected]>

rero_ils/modules/entities/views.py

@@ -32,6 +32,8 @@
 from .models import EntityType
 from .proxy import MEFProxyFactory
 
+import typing
+
 blueprint = Blueprint(
     'entities',
     __name__,
@@ -148,10 +150,11 @@ def entity_merge_data_values(data):
                 if isinstance(values, str):
                     values = [values]
                 for value in values:
-                    if value in result[key]:
-                        result[key][value].append(source)
-                    else:
-                        result[key][value] = [source]
+                    if isinstance(value, typing.Hashable):
+                        if value in result[key]:
+                            result[key][value].append(source)
+                        else:
+                            result[key][value] = [source]
     return result