ensure changelog script can handle empty alpha releases

CHANGELOG.md

@@ -1,3 +1,6 @@
+## 1.14.0-alpha20250716
+
+
 EXPERIMENTS:
 
 Experiments are only enabled in alpha releases of Terraform CLI. The following features are not yet available in stable releases.

scripts/changelog.sh

@@ -79,6 +79,14 @@ function generate {
         COMPLETE_VERSION="$LATEST_VERSION-$PRERELEASE_VERSION"
 
         npx -y changie@$CHANGIE_VERSION merge -u "## $COMPLETE_VERSION ($HUMAN_DATE)"
+
+        # If we have no changes yet, the changelog is empty now, so we need to add a header
+        if ! grep -q "$COMPLETE_VERSION" CHANGELOG.md; then
+            CURRENT_CHANGELOG=$(cat CHANGELOG.md)
+            echo "## $COMPLETE_VERSION" > CHANGELOG.md
+            echo "" >> CHANGELOG.md
+            echo "$CURRENT_CHANGELOG" >> CHANGELOG.md
+        fi
         ;;
 
         beta)