FIX: compare entities had not compared values of entites

src/caosdb/apiutils.py

@@ -639,6 +639,13 @@ def compare_entities(old_entity: Entity, new_entity: Entity):
                 newdiff["properties"][prop.name]["datatype"] = \
                     matching[0].datatype
 
+            if ((prop.value is not None and
+                    matching[0].value is not None) and
+                    (prop.value != matching[0].value)):
+                olddiff["properties"][prop.name]["value"] = prop.value
+                newdiff["properties"][prop.name]["value"] = \
+                    matching[0].value
+
             if (len(newdiff["properties"][prop.name]) == 0
                     and len(olddiff["properties"][prop.name]) == 0):
                 newdiff["properties"].pop(prop.name)