Description of problem:
There are several problems when writing rhs of a rule in Rule API:

• if you omit rhs() you 'nullend' on the end of the rule which results in
  compile error
• if you put comment in rhs() like rhs("//consequences") you get
  '//consequencesend' which result in compile error as well

I think there should be line delimiter behind rhs and that if rhs is omitted it
should result in empty string rather than "null".

KnowledgeDescr descr = DescrFactory.newPackage().name("org.sample")
.newRule().name("results in consequencesend")
.rhs("//consequences")
.end()

.newRule().name("results in nullend")
.lhs()
.pattern("String").end()
.end()
.end()

.getDescr();