Don't ruin highlighting if there's no descriptor in resolve session

#EA-61683 Fixed

idea/testData/codeInsight/lineMarker/BadCodeNoExceptions.kt

@@ -0,0 +1,10 @@
+trait Hi {
+    fun foo(): Int
+}
+
+// Closing brace is intentionally missed
+val id = array("kotlin.FlexibleType"
+
+private class Some(): Hi {
+    override fun foo() = 1
+}