Intentions: Fix contentRange() on empty KtBlockExpression

#KT-10776 Fixed

compiler/frontend/src/org/jetbrains/kotlin/psi/psiUtil/ktPsiUtil.kt

@@ -179,6 +179,7 @@ fun KtBlockExpression.contentRange(): PsiChildRange {
     val last = rBrace!!
             .siblings(forward = false, withItself = false)
             .first { it !is PsiWhiteSpace }
+    if (last == lBrace) return PsiChildRange.EMPTY
     return PsiChildRange(first, last)
 }
 

idea/testData/intentions/anonymousFunctionToLambda/emptyBody.kt

@@ -0,0 +1,5 @@
+fun acceptLambda(f: () -> Unit) = f()
+
+fun foo() {
+    acceptLambda(<caret>fun(): Unit {})
+}

idea/testData/intentions/anonymousFunctionToLambda/emptyBody.kt.after

@@ -0,0 +1,5 @@
+fun acceptLambda(f: () -> Unit) = f()
+
+fun foo() {
+    acceptLambda { }
+}

idea/tests/org/jetbrains/kotlin/idea/intentions/IntentionTestGenerated.java

@@ -439,6 +439,12 @@ public class IntentionTestGenerated extends AbstractIntentionTest {
             doTest(fileName);
         }
 
+        @TestMetadata("emptyBody.kt")
+        public void testEmptyBody() throws Exception {
+            String fileName = KotlinTestUtils.navigationMetadata("idea/testData/intentions/anonymousFunctionToLambda/emptyBody.kt");
+            doTest(fileName);
+        }
+
         @TestMetadata("expressionBody.kt")
         public void testExpressionBody() throws Exception {
             String fileName = KotlinTestUtils.navigationMetadata("idea/testData/intentions/anonymousFunctionToLambda/expressionBody.kt");