Debugger: do not throw exception on getting source position for Kotlin object

idea/testData/debugger/tinyApp/src/evaluate/singleBreakpoint/renderer/toStringRenderer.kt

@@ -0,0 +1,13 @@
+package toStringRenderer
+
+fun main(args: Array<String>) {
+    val a = A()
+    //Breakpoint!
+    args.size
+}
+
+class A {
+    override fun toString() = "myA"
+}
+
+// PRINT_FRAME