Python generated code: Delete API Requests can be blocked in API Gateways when sends empty body

[ShemTovYosef]

API Request for DELETE should not send anything by default; the current behavior sends an empty body
send: b'{}'
reply: 'HTTP/1.1 403 Forbidden\r\n'

Need to set {} to None

swagger-codegen-generators/src/main/resources/handlebars/python/rest.mustache

Line 150 in 39a2bcd

request_body = '{}'