ci: Do not fail if changelog is empty

.circleci/config.yml

@@ -33,7 +33,7 @@ jobs:
               PREVIOUS_TAG=$(git tag --sort=-version:refname | grep -vE "snapshot|beta|alpha|${CIRCLE_TAG}" | grep ${REGXP_TO_MATCH} | head -n 1)
               echo "Generating logs between the tags ${PREVIOUS_TAG} and ${CURRENT_TAG}"
               echo "Changes from the latest stable gnuton build (${PREVIOUS_TAG}):" > "${CHANGELOG_FILE}"
-              git log ${PREVIOUS_TAG}...${CURRENT_TAG} --pretty=format:'* %s' --reverse | grep -vE 'Merge branch|ci:|Bump' >> "${CHANGELOG_FILE}"
+              git log ${PREVIOUS_TAG}...${CURRENT_TAG} --pretty=format:'* %s' --reverse | grep -vE 'Merge branch|ci:|Bump' >> "${CHANGELOG_FILE}" || echo "WARNING: The Changelog is empty!!"
               cat "${CHANGELOG_FILE}"
             else
               echo "No changelog to generate. Changelog is generated only for tags matching ${REGXP_TO_MATCH}";