fix error, if no changes

.github/workflows/update_devices.yml

@@ -2,7 +2,7 @@ name: Update devices in wiki
 
 permissions:
   contents: write
-  
+
 on:
   workflow_dispatch:
   push:
@@ -45,6 +45,10 @@ jobs:
         cd mkdocs_branch
         git config --global user.name 'github-actions'
         git config --global user.email '[email protected]'
-        git add docs/features.md
-        git commit -m 'Update features.md with new device data'
-        git push origin mkdocs
+        if [[ -n $(git status --porcelain) ]]; then
+          git add docs/features.md
+          git commit -m 'Update features.md with new device data'
+          git push origin mkdocs
+        else
+          echo "No changes to commit"
+        fi