skip commit commands if nothing to commit

.gitlab-ci.yml

@@ -50,14 +50,14 @@ save:commitIndex:
 
     # commit
     - git branch -D tmpBranch || true
-    - git checkout -b tmpBranch
-    - git add --all
-    - git commit -m "Update index"
-    - git checkout $CI_COMMIT_REF_NAME
+    - git checkout -b tmpBranch || true
+    - git add --all || true
+    - git commit -m "Update index" || true
+    - git checkout $CI_COMMIT_REF_NAME || true
     - git pull origin $CI_COMMIT_REF_NAME
-    - git merge tmpBranch --ff
+    - git merge tmpBranch --ff || true
     - git push origin $CI_COMMIT_REF_NAME || true
-    - git branch -D tmpBranch
+    - git branch -D tmpBranch || true
 
 # build
 # ------------------------------------------------------------------------------------