diff --git a/fastapi_code_generator/__main__.py b/fastapi_code_generator/__main__.py
index f61415b..a551e87 100644
--- a/fastapi_code_generator/__main__.py
+++ b/fastapi_code_generator/__main__.py
@@ -127,10 +127,11 @@ def generate_code(
         parser = OpenAPIParser(input_text)
     with chdir(output_dir):
         models = parser.parse()
+    output = output_dir / model_path
     if not models:
-        return
+        # if no models (schemas), just generate an empty model file.
+        modules = {output: ("", input_name)}
     elif isinstance(models, str):
-        output = output_dir / model_path
         modules = {output: (models, input_name)}
     else:
         raise Exception('Modular references are not supported in this version')
diff --git a/tests/data/expected/openapi/default_template/body_and_parameters/main.py b/tests/data/expected/openapi/default_template/body_and_parameters/main.py
index 47bd8d9..3bf2b34 100644
--- a/tests/data/expected/openapi/default_template/body_and_parameters/main.py
+++ b/tests/data/expected/openapi/default_template/body_and_parameters/main.py
@@ -6,7 +6,7 @@
 
 from typing import List, Optional, Union
 
-from fastapi import FastAPI, Path, Query, UploadFile
+from fastapi import FastAPI, Path, Query, Request
 from starlette.requests import Request
 
 from .models import (
@@ -37,7 +37,7 @@ def post_bar(request: Request) -> None:
 
 
 @app.post('/convert', response_model=bytes)
-def convert(format: Optional[str] = 'pdf', file: UploadFile = ...) -> bytes:
+def convert(format: Optional[str] = 'pdf', request: Request = ...) -> bytes:
     pass
 
 
diff --git a/tests/data/expected/openapi/default_template/no_models/main.py b/tests/data/expected/openapi/default_template/no_models/main.py
new file mode 100644
index 0000000..23674f7
--- /dev/null
+++ b/tests/data/expected/openapi/default_template/no_models/main.py
@@ -0,0 +1,23 @@
+# generated by fastapi-codegen:
+#   filename:  no_models.yaml
+#   timestamp: 2020-06-19T00:00:00+00:00
+
+from __future__ import annotations
+
+from fastapi import FastAPI
+
+app = FastAPI(
+    version='1.0.0',
+    title='Swagger Petstore',
+    license={'name': 'MIT'},
+    description=None,
+    servers=[{'url': 'http://petstore.swagger.io/v1'}],
+)
+
+
+@app.get('/hello', response_model=str)
+def hello() -> str:
+    """
+    get hello message
+    """
+    pass
diff --git a/tests/data/expected/openapi/default_template/no_models/models.py b/tests/data/expected/openapi/default_template/no_models/models.py
new file mode 100644
index 0000000..a2cf986
--- /dev/null
+++ b/tests/data/expected/openapi/default_template/no_models/models.py
@@ -0,0 +1,3 @@
+# generated by fastapi-codegen:
+#   filename:  no_models.yaml
+#   timestamp: 2020-06-19T00:00:00+00:00
diff --git a/tests/data/openapi/default_template/no_models.yaml b/tests/data/openapi/default_template/no_models.yaml
new file mode 100644
index 0000000..e906d43
--- /dev/null
+++ b/tests/data/openapi/default_template/no_models.yaml
@@ -0,0 +1,22 @@
+openapi: "3.0.0"
+info:
+  version: 1.0.0
+  title: Swagger Petstore
+  license:
+    name: MIT
+  description: 
+
+servers:
+  - url: http://petstore.swagger.io/v1
+paths:
+  /hello:
+    get:
+      summary: get hello message
+      operationId: hello
+      responses:
+        '200':
+          description: message string
+          content:
+            text/plain:
+              schema:
+                type: string