[FIX] Log error during initialization of UI5 CLI

Unexpected errors during initialization of the UI5 CLI are now properly logged to the console.
Previously, such errors appeared as "TypeError [ERR_INVALID_ARG_TYPE]" error because
"process.stderr.write" was called with the error object, not a string.

Author: matz3

bin/ui5.cjs

@@ -117,7 +117,7 @@ if (process.env.NODE_ENV !== "test" || process.env.UI5_CLI_TEST_BIN_RUN_MAIN !==
 	ui5.main().catch((err) => {
 		process.stderr.write("Fatal Error: Unable to initialize UI5 CLI");
 		process.stderr.write("\n");
-		process.stderr.write(err);
+		process.stderr.write(String(err));
 		process.exit(1);
 	});
 }

test/bin/ui5.js

@@ -374,6 +374,5 @@ test.serial("integration: Executing main when required as main module (catch ini
 
 	t.deepEqual(processStderrWriteStub.getCall(0).args, ["Fatal Error: Unable to initialize UI5 CLI"]);
 	t.is(processStderrWriteStub.getCall(2).args.length, 1);
-	t.true(processStderrWriteStub.getCall(2).args[0] instanceof Error);
-	t.is(processStderrWriteStub.getCall(2).args[0].message, "TEST: Unable to invoke CLI");
+	t.is(processStderrWriteStub.getCall(2).args[0], "Error: TEST: Unable to invoke CLI");
 });