[FE] Don't fail with exception if ESVisitor tries to visit ESLambda

#KT-45243 Fixed

compiler/testData/diagnostics/testsWithStdLib/contracts/fromStdlib/kt45243.kt

@@ -0,0 +1,19 @@
+// ISSUE: KT-45243
+
+import kotlin.contracts.ExperimentalContracts
+import kotlin.contracts.contract
+
+@ExperimentalContracts
+fun <T> assertNotNull(actual: T) {
+    contract { returns() implies (actual != null) }
+}
+
+@ExperimentalContracts
+fun test_1() {
+    assertNotNull { }
+}
+
+@ExperimentalContracts
+fun test_2() {
+    assertNotNull({ })
+}