ENH: allow null values in dicts

src/caoscrawler/converters.py

@@ -513,6 +513,8 @@ class DictConverter(Converter):
                 children.append(DictBooleanElement(name, value))
             elif type(value) == float:
                 children.append(DictFloatElement(name, value))
+            elif type(value) == type(None):
+                continue
             else:
                 children.append(DictElement(name, value))
                 warnings.warn(f"The value in the dict for key:{name} has an unknown type. "

unittests/test_directories/examples_json/testjson.json

@@ -6,6 +6,7 @@
         {
 		    "firstname": "Miri",
 		    "lastname": "Mueller",
+		    "other": null,
 		    "email": "miri.mueller@science.de"
 	    },
         {