"Lift return / assignment": don't highlight if other returns available

idea/testData/inspectionsLocal/liftOut/whenToReturn/otherReturns.kt

@@ -0,0 +1,13 @@
+// HIGHLIGHT: INFORMATION
+
+fun test(n: Int, arg: String?): String {
+    <caret>when (n) {
+        1 -> {
+            if (arg == null) return ""
+            return "** $arg"
+        }
+        else -> {
+            return "Strange"
+        }
+    }
+}

idea/testData/inspectionsLocal/liftOut/whenToReturn/otherReturns.kt.after

@@ -0,0 +1,13 @@
+// HIGHLIGHT: INFORMATION
+
+fun test(n: Int, arg: String?): String {
+    return when (n) {
+        1 -> {
+            if (arg == null) return ""
+            "** $arg"
+        }
+        else -> {
+            "Strange"
+        }
+    }
+}