Allow secondary constructors without body

#KT-6967 Fixed

compiler/frontend/src/org/jetbrains/kotlin/parsing/JetParsing.java

@@ -908,7 +908,9 @@ public class JetParsing extends AbstractJetParsing {
             emptyDelegationCall.done(CONSTRUCTOR_DELEGATION_CALL);
         }
 
-        parseBlock();
+        if (at(LBRACE)) {
+            parseBlock();
+        }
     }
 
     private void parseThisOrSuper() {

compiler/frontend/src/org/jetbrains/kotlin/psi/JetSecondaryConstructor.java

@@ -88,7 +88,7 @@ public class JetSecondaryConstructor extends JetDeclarationStub<KotlinPlaceHolde
 
     @Nullable
     @Override
-    public JetExpression getBodyExpression() {
+    public JetBlockExpression getBodyExpression() {
         return findChildByClass(JetBlockExpression.class);
     }
 
@@ -105,7 +105,7 @@ public class JetSecondaryConstructor extends JetDeclarationStub<KotlinPlaceHolde
 
     @Override
     public boolean hasBody() {
-        return true;
+        return getBodyExpression() != null;
     }
 
     @Override