[CND PARSER] Fixed parsing bug

[dantleech]

Do not crash if no more tokens after supertype declration..

Currently token peek returns the next token and then we get the type of the token, however if you declare a supertype for a node definition but do not define anything after, peek returns null and we get a fatal error when trying to access null as an object.

e.g.

<slinp = "http://slinp.com/ns/1.0">

[slinp:resource] > mix:created, mix:lastModified, nt:base
abstract
+ * (slinp:resource)

[slinp:webFolder] > nt:base
+ root (slinp:resource)

[slinp:root] > nt:base
+ web (slinp:webFolder) = slinp:webFolder autocreated

[slinp:article] > slinp:resource

Would crash the parser.

[dbu]

thanks. could you add a test case for this to be sure its fixed and to avoid regression?

build fail is still the performance test.

[dantleech]

There are no existing concrete tests for the CND parser -- I am guessing that it would require a full implementation or extensive mocking?

[dbu]

ah ok, then its out of scope for this bugfix. i created #111 about this - if you feel like it, would be awesome.