Fix missing print command in a GN error case.

tools/gn/commands.cc

 // Copyright (c) 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "tools/gn/commands.h"
 
 #include "base/command_line.h"
 #include "tools/gn/builder.h"
 #include "tools/gn/filesystem_utils.h"
 #include "tools/gn/item.h"
@@ skipping 379 matching lines @@
     Err(Location(), "Label not found.",
         label.GetUserVisibleName(false) + " not found.").PrintToStdout();
     return nullptr;
   }
 
   const Target* target = item->AsTarget();
   if (!target) {
     Err(Location(), "Not a target.",
         "The \"" + label.GetUserVisibleName(false) + "\" thing\n"
         "is not a target. Somebody should probably implement this command for "
-        "other\nitem types.");
+        "other\nitem types.").PrintToStdout();
     return nullptr;
   }
 
   return target;
 }
 
 bool ResolveFromCommandLineInput(
     Setup* setup,
     const std::vector<std::string>& input,
     bool all_toolchains,
@@ skipping 70 matching lines @@
   }
 }
 
 void FilterAndPrintTargetSet(bool indent,
                              const std::set<const Target*>& targets) {
   std::vector<const Target*> target_vector(targets.begin(), targets.end());
   FilterAndPrintTargets(indent, &target_vector);
 }
 
 }  // namespace commands