Fix compile_commands.json for MSVC (#238)

* fix: compile_commands.json for MSVC

generator_output is None when trying to use that in Node.js via vcbuild.bat

* Review fix

* Update pylib/gyp/generator/compile_commands_json.py

Co-authored-by: Yagiz Nizipli <yagiz@nizipli.com>

---------

Co-authored-by: Yagiz Nizipli <yagiz@nizipli.com>

pylib/gyp/generator/compile_commands_json.py

@@ -109,7 +109,8 @@ def GenerateOutput(target_list, target_dicts, data, params):
         AddCommandsForTarget(cwd, target, params, per_config_commands)
 
     try:
-        output_dir = params["options"].generator_output
+        # generator_output can be `None` on Windows machines
+        output_dir = params["options"].generator_output or os.getcwd()
     except (AttributeError, KeyError):
         output_dir = params["generator_flags"].get("output_dir", "out")
     for configuration_name, commands in per_config_commands.items():