Add else entry for when quick fix

idea/testData/quickfix/when/afterNoElseInWhenWithBranches.kt

@@ -0,0 +1,10 @@
+// "Add else branch" "true"
+fun test() {
+    val a = 12
+    wh<caret>en (a) {
+        in 0..11 -> { /* some code */ }
+        12, 13, 14 -> { /* some code */ }
+        else -> {
+        }
+    }
+}

idea/testData/quickfix/when/afterNoElseInWhenWithoutBranches.kt

@@ -0,0 +1,8 @@
+// "Add else branch" "true"
+fun test() {
+    val a = 12
+    when (a) {
+        else -> {
+        }
+    }
+}

idea/testData/quickfix/when/beforeNoElseInWhenWithBranches.kt

@@ -0,0 +1,8 @@
+// "Add else branch" "true"
+fun test() {
+    val a = 12
+    wh<caret>en (a) {
+        in 0..11 -> { /* some code */ }
+        12, 13, 14 -> { /* some code */ }
+    }
+}

idea/testData/quickfix/when/beforeNoElseInWhenWithoutBranches.kt

@@ -0,0 +1,6 @@
+// "Add else branch" "true"
+fun test() {
+    val a = 12
+    wh<caret>en (a) {
+    }
+}