Bug 1250520 - Handle reporting DebuggeeWouldRun when the script has no filename. (r=fitzgen)

js/src/vm/Debugger.cpp

@@ -346,12 +346,13 @@ class MOZ_RAII js::EnterDebuggeeNoExecute
                     fprintf(stdout, "Dumping stack for DebuggeeWouldRun:\n");
                     DumpBacktrace(cx);
                 }
+                const char* filename = script->filename() ? script->filename() : "(none)";
                 char linenoStr[15];
                 JS_snprintf(linenoStr, sizeof(linenoStr), "%" PRIuSIZE, script->lineno());
                 unsigned flags = warning ? JSREPORT_WARNING : JSREPORT_ERROR;
                 return JS_ReportErrorFlagsAndNumber(cx, flags, GetErrorMessage, nullptr,
                                                     JSMSG_DEBUGGEE_WOULD_RUN,
-                                                    script->filename(), linenoStr);
+                                                    filename, linenoStr);
             }
         }
         return true;