Print Preview: Fix handling of printers without capabilities.

chrome/browser/ui/webui/print_preview/printer_capabilities.cc

Index: chrome/browser/ui/webui/print_preview/printer_capabilities.cc
diff --git a/chrome/browser/ui/webui/print_preview/printer_capabilities.cc b/chrome/browser/ui/webui/print_preview/printer_capabilities.cc
index 27c95fb8cf3f014f479de1a9c6a5a7c25b5dd945..5279af4efaf21d5924093b6f94bdfb33d6431860 100644
--- a/chrome/browser/ui/webui/print_preview/printer_capabilities.cc
+++ b/chrome/browser/ui/webui/print_preview/printer_capabilities.cc
@@ -95,10 +95,10 @@ std::unique_ptr<base::DictionaryValue> GetSettingsOnBlockingPool(
   printer_info->SetString(kSettingPrinterName, printer_name);
   printer_info->SetString(kSettingPrinterDescription, printer_description);
 
-  std::unique_ptr<base::DictionaryValue> capabilities =
-      GetPrinterCapabilitiesOnBlockingPoolThread(device_name);
-  if (capabilities)
-    printer_info->Set(kPrinterCapabilities, std::move(capabilities));
+  auto capabilities = GetPrinterCapabilitiesOnBlockingPoolThread(device_name);
+  if (!capabilities)
+    capabilities = base::MakeUnique<base::DictionaryValue>();
+  printer_info->Set(kPrinterCapabilities, std::move(capabilities));
 
   return printer_info;
 }