chakrashim: check return value for inspector call

The return value for JsDiagGetScripts was not being validated and
continuing on during an error condition.

deps/chakrashim/src/inspector/v8-debugger.cc

@@ -77,22 +77,25 @@ void V8Debugger::getCompiledScripts(
     int contextGroupId,
     std::vector<std::unique_ptr<V8DebuggerScript>>& result) {
   JsValueRef scripts;
-  JsDiagGetScripts(&scripts);
+  if (JsDiagGetScripts(&scripts) != JsNoError) {
+    assert(false);
+    return;
+  }
 
-  int length;
+  int length = 0;
   if (jsrt::InspectorHelpers::GetIntProperty(scripts, "length", &length) != JsNoError) {
     assert(false);
     return;
   }
 
   for (int i = 0; i < length; i++) {
-    JsValueRef index;
+    JsValueRef index = nullptr;
     if (JsIntToNumber(i, &index) != JsNoError) {
       assert(false);
       return;
     }
 
-    JsValueRef script;
+    JsValueRef script = nullptr;
     if (JsGetIndexedProperty(scripts, index, &script) != JsNoError) {
       assert(false);
       return;