Removes nulltype from python, updates samples (#8555)

* Removes nulltype from python, updates samples

* Removes nulltype from the python requirements

* Removes nulltype import in models, moves requiredVars to optionalVars when approprieate

Author: spacether

.generator/templates/model.mustache

@@ -3,8 +3,6 @@
 import re  # noqa: F401
 import sys  # noqa: F401
 
-import nulltype  # noqa: F401
-
 from {{packageName}}.model_utils import (  # noqa: F401
     ApiTypeError,
     ModelComposed,

.generator/templates/model_templates/method_init_composed.mustache

@@ -24,11 +24,6 @@
             '{{name}}': {{name}},
 {{/requiredVars}}
         }
-        # remove args whose value is Null because they are unset
-        required_arg_names = list(required_args.keys())
-        for required_arg_name in required_arg_names:
-            if required_args[required_arg_name] is nulltype.Null:
-                del required_args[required_arg_name]
         model_args = {}
         model_args.update(required_args)
         model_args.update(kwargs)

.generator/templates/requirements.mustache

@@ -1,4 +1,3 @@
-nulltype
 python_dateutil >= 2.5.3
 setuptools >= 21.0.0
 urllib3 >= 1.25.3

.generator/templates/setup.mustache

@@ -17,7 +17,6 @@ VERSION = "{{packageVersion}}"
 REQUIRES = [
   "urllib3 >= 1.25.3",
   "python-dateutil",
-  "nulltype",
 {{#asyncio}}
   "aiohttp >= 3.0.0",
 {{/asyncio}}