Improve error handling and logging for nbgv commands

Co-authored-by: csharpfritz <78577+csharpfritz@users.noreply.github.com>

Author: Copilot

scripts/generate-release-notes.sh

@@ -68,5 +68,8 @@ git log "$MERGE_BASE"..HEAD --no-merges --pretty=format:"- %aN" | sort -u
 echo ""
 echo ""
 # Note: When using this in a GitHub release, replace {PREVIOUS_VERSION} with the actual previous version tag
-CURRENT_VERSION=$(nbgv get-version -v Version 2>/dev/null || echo "0.0")
+CURRENT_VERSION=$(nbgv get-version -v Version 2>/dev/null)
+if [ -z "$CURRENT_VERSION" ]; then
+    CURRENT_VERSION="UNKNOWN_VERSION"
+fi
 echo "_Full Changelog_: https://github.com/FritzAndFriends/BlazorWebFormsComponents/compare/v{PREVIOUS_VERSION}...v${CURRENT_VERSION}"

scripts/publish-release.sh

@@ -33,10 +33,16 @@ if ! git diff-index --quiet HEAD --; then
 fi
 
 # Get the version from nbgv
-VERSION=$(nbgv get-version -v Version 2>/dev/null)
+VERSION=$(nbgv get-version -v Version 2>&1)
+if [ $? -ne 0 ]; then
+    echo -e "${RED}Error: Could not read version using nbgv${NC}" >&2
+    echo "nbgv output: $VERSION" >&2
+    echo "Make sure you are in a git repository with version.json" >&2
+    exit 1
+fi
+
 if [ -z "$VERSION" ]; then
-    echo -e "${RED}Error: Could not read version using nbgv${NC}"
-    echo "Make sure you are in a git repository with version.json"
+    echo -e "${RED}Error: nbgv returned an empty version${NC}" >&2
     exit 1
 fi