fix when there's no file

Readme.md

@@ -46,7 +46,8 @@ An error:
 Returns nil if there is no error.
 Returns the error encountered during the upload process otherwise.
 
-##Configuration
+## Configuration
+
 Make sure to set up the GOOGLE_STORAGE_BUCKET_NAME environment variable in your environment. This should point to the path of the Google user account key you've previously created:
 
 ```yaml
@@ -55,5 +56,6 @@ export GOOGLE_STORAGE_BUCKET_NAME=path_to_your_google_account_key.json
 
 Replace path_to_your_google_account_key.json with the actual path to your Google user account key file.
 
-##Contributing
+## Contributing
+
 Feel free to open issues or PRs if you find any problems or have suggestions!

gcpfileupload.go

@@ -32,6 +32,9 @@ func NewFileUploader(r *http.Request, formFile string, fileName string, bucketNa
 func (fu *FileUploader) Upload() (bool, error) {
 	file, header, err := fu.Request.FormFile(fu.FormFile)
 	if err != nil {
+		if err == http.ErrMissingFile {
+			return false, nil
+		}
 		return false, err
 	}
 	defer file.Close()