[nostalgia/gfx/studio,studio] Fix CLI tool output to only show usage if no args given

src/nostalgia/modules/gfx/src/studio/subcommands/export-tilesheet/export-tilesheet.cpp

@@ -133,6 +133,9 @@ ox::Error cmdExportTilesheet(studio::Project &project, ox::SpanView<ox::CString>
 				"[-scale <int>]\n");
 		}
 	};
+	if (args.empty()) {
+		return {};
+	}
 	OX_REQUIRE(srcPath, clargs.getString("src-path").transformError(1, "no src path specified"));
 	OX_REQUIRE(dstPath, clargs.getString("dst-path").transformError(2, "no dst path specified"));
 	auto const palPath = clargs.getString("pal-path", "");

src/olympic/studio/applib/src/app.cpp

@@ -90,7 +90,10 @@ static ox::Error run(
 							return ox::Error{2, "failed to load project directory"};
 						}
 						Project project{*kctx.value, projectDir, projectDataDir};
-						return c.func(project, args + numCmdArgs);
+						return c.func(
+							project,
+							args.size() > numCmdArgs ?
+								 args + numCmdArgs : ox::SpanView<ox::CString>{});
 					}
 				}
 				return ox::Error{1, "command not found"};