"Add missing component" intention: fix it works correctly if entries is empty

#KT-36094 Fixed

idea/testData/intentions/addMissingDestructuring/empty.kt

@@ -0,0 +1,5 @@
+data class Foo(val a: String, val b: String, val c: String)
+
+fun bar(f: Foo) {
+    val (<caret>) = f
+}

idea/testData/intentions/addMissingDestructuring/empty.kt.after

@@ -0,0 +1,5 @@
+data class Foo(val a: String, val b: String, val c: String)
+
+fun bar(f: Foo) {
+    val (a, b, c) = f
+}