Update action.yml to handle undefined yaml-path arg

action.yml

@@ -23,7 +23,6 @@ inputs:
   yaml-path:
     description: 'Path to the YAML file'
     required: false
-    default: 'None'
 
 # Outputs generated by running this action.
 outputs:
@@ -53,15 +52,15 @@ runs:
     - name: run updatesnapyaml
       id: updatesnapyaml
       run: |
-        ./desktop-snaps/updatesnap/updatesnapyaml.py --github-user $GITHUB_USER --github-token $GITHUB_TOKEN --version-schema $VERSION_SCHEMA --rock-version-schema $ROCK_VERSION_SCHEMA --yaml-path $YAML_PATH https://github.com/${{ github.repository }}
+        ./desktop-snaps/updatesnap/updatesnapyaml.py --github-user $GITHUB_USER --github-token $GITHUB_TOKEN --version-schema $VERSION_SCHEMA --rock-version-schema $ROCK_VERSION_SCHEMA ${YAML_PATH:+--yaml-path $YAML_PATH} https://github.com/${{ github.repository }}
         # Make sure to put the updated snapcraft.yaml file in the right location if it lives in a snap directory
         if [ -f version_file ]; then
           echo "IS_VERSION_CHANGE=true" >> $GITHUB_ENV
           rm version_file
         fi
         if [ -f output_file ]; then
           echo "IS_CHANGE=true" >> $GITHUB_ENV
-          if [ "$YAML_PATH" != 'None' ]; then
+          if [ -n "$YAML_PATH" ]; then
             mv output_file $YAML_PATH
           elif [ -f rockcraft.yaml ]; then
             mv output_file rockcraft.yaml