fix(runtime): read no inspector flags from a nil Arguments array

Config.Arguments is optional, but enableInspector indexed it whenever
ArgumentsCount was above one. Stop at a nil array, and at a null element
the way a C argv reader does, so the count alone can no longer make
debug startup dereference an invalid pointer.

Author: adrian-niculescu

NativeScript/inspector/JsV8InspectorClient.mm

@@ -181,7 +181,9 @@ bool ShouldRewriteSourceMapURLs() {
 
   notify_post(NOTIFICATION("AppLaunching"));
 
-  for (int i = 1; i < argc; i++) {
+  // A nil Arguments array carries no flags whatever ArgumentsCount says, and a
+  // null element ends the list the way it does in a C argv.
+  for (int i = 1; argv != nullptr && i < argc && argv[i] != nullptr; i++) {
     BOOL startListening = NO;
     BOOL shouldWaitForDebugger = NO;