bugfix: generate correct setup.pi when no paths are specified (#20098)

modules/openapi-generator/src/main/resources/python/setup.mustache

@@ -13,9 +13,6 @@ from setuptools import setup, find_packages  # noqa: H301
 NAME = "{{{projectName}}}"
 VERSION = "{{packageVersion}}"
 PYTHON_REQUIRES = ">= 3.8"
-{{#apiInfo}}
-{{#apis}}
-{{#-last}}
 REQUIRES = [
     "urllib3 >= 1.25.3, < 3.0.0",
     "python-dateutil >= 2.8.2",
@@ -52,6 +49,3 @@ setup(
     """,  # noqa: E501
     package_data={"{{{packageName}}}": ["py.typed"]},
 )
-{{/-last}}
-{{/apis}}
-{{/apiInfo}}

modules/openapi-generator/src/test/java/org/openapitools/codegen/python/PythonClientCodegenTest.java

@@ -28,6 +28,8 @@ import io.swagger.v3.parser.util.SchemaTypeUtil;
 import org.openapitools.codegen.*;
 import org.openapitools.codegen.languages.PythonClientCodegen;
 import org.openapitools.codegen.languages.features.CXFServerFeatures;
+
+import static org.junit.jupiter.api.Assertions.assertNull;
 import static org.openapitools.codegen.TestUtils.assertFileContains;
 import static org.openapitools.codegen.TestUtils.assertFileExists;
 import org.openapitools.codegen.TestUtils;
@@ -541,4 +543,27 @@ public class PythonClientCodegenTest {
         Assert.assertEquals(codegen.toEnumValue("1.0", "float"), "1.0");
         Assert.assertEquals(codegen.toEnumValue("1", "int"), "1");
     }
+
+    @Test
+    public void testHandleNoApis() throws IOException {
+        File output = Files.createTempDirectory("test").toFile().getCanonicalFile();
+        output.deleteOnExit();
+        final OpenAPI openAPI = TestUtils.parseFlattenSpec("src/test/resources/3_0/no_apis.yaml");
+        final DefaultGenerator defaultGenerator = new DefaultGenerator();
+        final ClientOptInput clientOptInput = new ClientOptInput();
+        clientOptInput.openAPI(openAPI);
+        PythonClientCodegen pythonClientCodegen = new PythonClientCodegen();
+        pythonClientCodegen.setOutputDir(output.getAbsolutePath());
+        clientOptInput.config(pythonClientCodegen);
+        defaultGenerator.opts(clientOptInput);
+
+        Map<String, File> files = defaultGenerator.generate().stream().collect(Collectors.toMap(File::getPath, Function.identity()));
+
+        File apiFile = files.get(Paths.get(output.getAbsolutePath(), "openapi_client", "api", "hello_example_api.py").toString());
+        assertNull(apiFile);
+
+        File setupFile = files.get(Paths.get(output.getAbsolutePath(), "setup.py").toString());
+        assertNotNull(setupFile);
+        assertFileContains(setupFile.toPath(), "setup(");
+    }
 }

modules/openapi-generator/src/test/resources/3_0/no_apis.yaml

@@ -0,0 +1,16 @@
+openapi: 3.0.3
+info:
+  title: Example Hello API
+  description: ''
+  version: v1
+servers:
+  - url: http://localhost
+    description: Global Endpoint
+paths: {}
+components:
+  schemas:
+    HelloResponse:
+      type: object
+      properties:
+        message:
+          type: string