Add hasInitializer() to JetWithExpressionInitializer interface

compiler/frontend/src/org/jetbrains/jet/lang/psi/JetMultiDeclarationEntry.java

@@ -53,6 +53,11 @@ public class JetMultiDeclarationEntry extends JetNamedDeclarationNotStubbed impl
         return null;
     }
 
+    @Override
+    public boolean hasInitializer() {
+        return false;
+    }
+
     @NotNull
     private ASTNode getParentNode() {
         ASTNode parent = getNode().getTreeParent();

compiler/frontend/src/org/jetbrains/jet/lang/psi/JetNamedFunction.java

@@ -85,6 +85,11 @@ public class JetNamedFunction extends JetTypeParameterListOwnerStub<PsiJetFuncti
         return PsiTreeUtil.getNextSiblingOfType(getEqualsToken(), JetExpression.class);
     }
 
+    @Override
+    public boolean hasInitializer() {
+        return getInitializer() != null;
+    }
+
     @Override
     public ItemPresentation getPresentation() {
         return ItemPresentationProviders.getItemPresentation(this);

compiler/frontend/src/org/jetbrains/jet/lang/psi/JetProperty.java

@@ -214,6 +214,7 @@ public class JetProperty extends JetTypeParameterListOwnerStub<PsiJetPropertyStu
         return null;
     }
 
+    @Override
     public boolean hasInitializer() {
         PsiJetPropertyStub stub = getStub();
         if (stub != null) {

compiler/frontend/src/org/jetbrains/jet/lang/psi/JetPropertyAccessor.java

@@ -122,4 +122,9 @@ public class JetPropertyAccessor extends JetDeclarationStub<PsiJetPropertyAccess
     public JetExpression getInitializer() {
         return PsiTreeUtil.getNextSiblingOfType(getEqualsToken(), JetExpression.class);
     }
+
+    @Override
+    public boolean hasInitializer() {
+        return getInitializer() != null;
+    }
 }

compiler/frontend/src/org/jetbrains/jet/lang/psi/JetWithExpressionInitializer.java

@@ -22,4 +22,6 @@ import org.jetbrains.annotations.Nullable;
 public interface JetWithExpressionInitializer extends PsiElement {
     @Nullable
     JetExpression getInitializer();
+
+    boolean hasInitializer();
 }