Use null instead of CompilerMessageLocation.NO_LOCATION in MessageCollector

compiler/tests/org/jetbrains/kotlin/daemon/CompilerApiTest.kt

@@ -188,8 +188,7 @@ class CompilerApiTest : KotlinIntegrationTestBase() {
 }
 
 class TestMessageCollector : MessageCollector {
-
-    data class Message(val severity: CompilerMessageSeverity, val message: String, val location: CompilerMessageLocation)
+    data class Message(val severity: CompilerMessageSeverity, val message: String, val location: CompilerMessageLocation?)
 
     val messages = arrayListOf<Message>()
 
@@ -197,9 +196,9 @@ class TestMessageCollector : MessageCollector {
         messages.clear()
     }
 
-    override fun report(severity: CompilerMessageSeverity, message: String, location: CompilerMessageLocation) {
+    override fun report(severity: CompilerMessageSeverity, message: String, location: CompilerMessageLocation?) {
         messages.add(Message(severity, message, location))
     }
 
     override fun hasErrors(): Boolean = messages.any { it.severity == CompilerMessageSeverity.EXCEPTION || it.severity == CompilerMessageSeverity.ERROR }
-}
+}