mkvparser: Cluster::Create clean up.
mkvparser: Cluster::Create clean up.

- Asserts to error condition check and return.
- Use nothrow new.

Change-Id: Iff9da5806e6f3240e7ea9f9e90ccdf729848a778

webmproject/libwebm,zofuthan/libwebm,webmproject/libwebm,felipebetancur/libwebm,felipebetancur/libwebm,zofuthan/libwebm,webmproject/libwebm