fix: sourceplusplus/sourceplusplus#1035

Author: BFergerson

marker/jvm-marker/src/main/kotlin/spp/jetbrains/marker/jvm/service/utils/JVMMarkerUtils.kt

@@ -170,7 +170,7 @@ object JVMMarkerUtils {
 
     //todo: better
     private fun getQualifiedName(method: KtNamedFunction): String {
-        val methodName = method.nameIdentifier!!.text
+        val methodName = method.nameIdentifier?.text ?: method.name ?: "unknown"
         var methodParams = ""
         method.valueParameters.forEach {
             if (methodParams.isNotEmpty()) {