Setting isAbstract:true on a method still puts in a blank implementation

[joseph-whiting]

When including a method in a declaration of abstract class, providing isAbstract: true still produces an empty implementation, like

abstract class {
   abstract myMethod() {}
}

instead it should not provide an implementation

[dsherret]

Ah yes thanks for reporting! This was actually fixed by @cancerberoSgx in this PR, but it hasn't been merged yet https://github.com/dsherret/ts-simple-ast/pull/346/files#diff-9428f443549f69ecf41f4d9aeaa833daR31

@cancerberoSgx would you be willing to submit your fix to that as a separate PR? Otherwise I will fix this soon as I can.

[dsherret]

Ok, this was too easy of a bug fix so I just fixed it now in 12.5.1.