Add intention to replace "Map.getOrDefault"

#KT-21503 Fixed

idea/testData/intentions/replaceMapGetOrDefault/nullableValue.kt

@@ -0,0 +1,6 @@
+// IS_APPLICABLE: false
+// RUNTIME_WITH_FULL_JDK
+fun main() {
+    val map = mapOf(1 to "", 2 to null)
+    val b = map.getOrDefault<caret>(2, "bar") == null
+}