fix(API): filter null values of requrest structs

Some servers, like youtube, reject null values possibly thanks to
the reliance on parts. Now we are filtering them (in a very inefficient,
but working way), which seems to be fine with the servers.

Effectively, we seem to be able now to upload videos ... .

More testing required !

etc/api/type-api.yaml

@@ -27,3 +27,4 @@ cargo:
     - url = "*"
     - serde = ">= 0.3.0"
     - serde_macros = "*"
+    - json-tools = "*"

etc/api/type-cli.yaml

@@ -31,4 +31,3 @@ cargo:
     - serde = ">= 0.3.0"
     - serde_macros = "*"
     - clap = "*"
-    - json-tools = "*"

src/mako/api/lib.rs.mako

@@ -37,6 +37,7 @@ extern crate serde;
 extern crate yup_oauth2 as oauth2;
 extern crate mime;
 extern crate url;
+extern crate json_tools;
 
 mod cmn;
 

src/mako/api/lib/mbuild.mako

@@ -663,7 +663,18 @@ else {
 
         % if request_value:
         let mut json_mime_type = mime::Mime(mime::TopLevel::Application, mime::SubLevel::Json, Default::default());
-        let mut request_value_reader = io::Cursor::new(json::to_vec(&self.${property(REQUEST_VALUE_PROPERTY_NAME)}));
+        let mut request_value_reader = 
+            {
+                let json_cache = json::to_string(&self.${property(REQUEST_VALUE_PROPERTY_NAME)}).unwrap();
+                io::Cursor::new(json_tools::TokenReader::new(
+                                    json_tools::FilterTypedKeyValuePairs::new(
+                                        json_tools::Lexer::new(
+                                                json_cache.bytes(), 
+                                                json_tools::BufferType::Span),
+                                        json_tools::TokenType::Null),
+                                        Some(&json_cache)).bytes().filter_map(|v|v.ok()).collect::${'<Vec<u8>>'}()
+                                )
+            };
         let request_size = request_value_reader.seek(io::SeekFrom::End(0)).unwrap();
         request_value_reader.seek(io::SeekFrom::Start(0)).unwrap();
         % endif