[squeak-smalltalk/squeak-object-memory] Regression in Compiler | Three consecutive empty statements in a block (Issue #168)

marceltaeumel created an issue (squeak-smalltalk/squeak-object-memory#168)

In blocks, we cannot have **three consecutive** empty statements with only a comment each anymore:

```Smalltalk
[ "1" . ] value.  "-> nil"
[ "1" . "2" . ] value.  "-> nil"
[ "1" . "2" . "3" . ] value.  "-> NotImplemented on CommentNode"
```

There is a regression in

`BlockNode >> sizeCodeForEvaluatedFullClosureValue:`

Works in Squeak 6.0. Works in regular methods.

We probably need to extend the other exit condition:

```Smalltalk
((statements last isJust: NodeNil) and: [self returns not]) 
```

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