Update parser to ignore "section" nodes

[iamralpht]

There's a new SECTION node type, which causes the parser to abort. It's used for organizing a doc, and has some impact on prototyping actions. I think it's safe to ignore this node type, as a section cannot be embedded in a frame (so won't be encountered within a component).

[Methodician]

Is this related to the vague JSON parsing errors as mentinoed in this issue?

If so, it doesn't seem to be solved. This should be integrated into the latest release which we have installed, but we continue to encounter the same serialization error when a section node is present.