do not fold empty blocks

src/main/java/org/jastadd/tooling/aspect/AspectFoldingBuilder.java

@@ -24,34 +24,44 @@ public class AspectFoldingBuilder extends FoldingBuilderEx {
     List<FoldingDescriptor> descriptors = new ArrayList<>();
     Collection<JastAddAspectAspectDeclaration> aspectDeclarations = PsiTreeUtil.findChildrenOfType(root, JastAddAspectAspectDeclaration.class);
     for (final JastAddAspectAspectDeclaration aspectDeclaration : aspectDeclarations) {
+      if (aspectDeclaration.getAspectBody().getTextRange().getLength() > 2) {
         descriptors.add(new FoldingDescriptor(aspectDeclaration.getNode(),
           new TextRange(aspectDeclaration.getAspectBody().getTextRange().getStartOffset() + 1,
             aspectDeclaration.getAspectBody().getTextRange().getEndOffset() - 1)));
       }
+    }
     Collection<JastAddAspectClassDeclaration> classDeclarations = PsiTreeUtil.findChildrenOfType(root, JastAddAspectClassDeclaration.class);
     for (final JastAddAspectClassDeclaration classDeclaration : classDeclarations) {
+      if (classDeclaration.getClassBody().getTextRange().getLength() > 2) {
         descriptors.add(new FoldingDescriptor(classDeclaration.getNode(),
           new TextRange(classDeclaration.getClassBody().getTextRange().getStartOffset() + 1,
             classDeclaration.getClassBody().getTextRange().getEndOffset() - 1)));
       }
+    }
     Collection<JastAddAspectEnumBody> enumBodies = PsiTreeUtil.findChildrenOfType(root, JastAddAspectEnumBody.class);
     for (final JastAddAspectEnumBody enumBody : enumBodies) {
+      if (enumBody.getTextRange().getLength() > 2) {
         descriptors.add(new FoldingDescriptor(enumBody.getNode(),
           new TextRange(enumBody.getTextRange().getStartOffset() + 1,
             enumBody.getTextRange().getEndOffset() - 1)));
       }
+    }
     Collection<JastAddAspectAnnotationTypeBody> annotationTypeBodies = PsiTreeUtil.findChildrenOfType(root, JastAddAspectAnnotationTypeBody.class);
     for (final JastAddAspectAnnotationTypeBody annotationTypeBody : annotationTypeBodies) {
+      if (annotationTypeBody.getTextRange().getLength() > 2) {
         descriptors.add(new FoldingDescriptor(annotationTypeBody.getNode(),
           new TextRange(annotationTypeBody.getTextRange().getStartOffset() + 1,
             annotationTypeBody.getTextRange().getEndOffset() - 1)));
       }
+    }
     Collection<JastAddAspectBlock> aspectBlocks = PsiTreeUtil.findChildrenOfType(root, JastAddAspectBlock.class);
     for (final JastAddAspectBlock block : aspectBlocks) {
+      if (block.getTextRange().getLength() > 2) {
         descriptors.add(new FoldingDescriptor(block.getNode(),
           new TextRange(block.getTextRange().getStartOffset() + 1,
             block.getTextRange().getEndOffset() - 1)));
       }
+    }
     return descriptors.toArray(new FoldingDescriptor[0]);
   }